RHSA-2026:76993
Vulnerability from csaf_redhat - Published: 2026-10-07 02:20 - Updated: 2026-10-07 04:03Summary
Red Hat Security Advisory: openssh security update
Severity
Important
Notes
Topic: An update for openssh is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.
Security Fix(es):
* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions (CVE-2026-55655)
* openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)
* openssh: OpenSSH: sftp client allows attacker to control downloaded file location (CVE-2026-59995)
* openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)
* openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options (CVE-2026-59999)
* openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).
4.3 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-0:8.7p1-38.el9_4.10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-0:8.7p1-38.el9_4.10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-0:8.7p1-38.el9_4.10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-0:8.7p1-38.el9_4.10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
85 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
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|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-0:0.10.4-5.38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-0:0.10.4-5.38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-0:0.10.4-5.38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-0:0.10.4-5.38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-0:8.7p1-38.el9_4.10.src | — |
Workaround
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|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
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|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
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|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
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|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.ppc64le | — |
Workaround
|
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.s390x | — |
Workaround
|
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.x86_64 | — |
Workaround
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Threats
Impact
Moderate
A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.
5.0 (Medium)
Affected products
Fixed
4 products, the same list as for
CVE-2026-55653
Known not affected
85 products, the same list as for
CVE-2026-55653
Threats
Impact
Moderate
A flaw was found in OpenSSH. The `sftp` client, when used to download files from a malicious server with the 'sftp server:/path .' command, does not properly restrict where those files are saved. This allows an attacker to control the download location, potentially overwriting existing files or placing malicious files in sensitive directories on the client system, which could compromise system integrity.
5.4 (Medium)
Affected products
Fixed
4 products, the same list as for
CVE-2026-55653
Known not affected
85 products, the same list as for
CVE-2026-55653
Threats
Impact
Moderate
A flaw was found in OpenSSH, a widely used tool for secure remote access. When a user attempts to copy files between two different remote systems using the `scp` command, the file might be incorrectly placed in a directory above the intended destination. This unintended file placement could lead to data integrity issues or, in some cases, unauthorized access to sensitive information if files are stored in an exposed location.
4.6 (Medium)
Affected products
Fixed
4 products, the same list as for
CVE-2026-55653
Known not affected
85 products, the same list as for
CVE-2026-55653
Threats
Impact
Moderate
A flaw was found in `sshd`, the OpenSSH server daemon. When `DisableForwarding=yes` is configured to prevent network traffic forwarding, it incorrectly fails to take precedence over `PermitTunnel=yes`. This allows a remote attacker to bypass intended security restrictions and establish a tunnel, potentially leading to unauthorized network access or circumvention of security policies, even when forwarding is explicitly disabled.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-server-0:8.7p1-38.el9_4.10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
85 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
Workaround
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.ppc64le | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-keycat-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.aarch64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-server-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:openssh-sk-dummy-debuginfo-0:8.7p1-38.el9_4.10.x86_64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-0:0.10.4-5.38.el9_4.10.aarch64 | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.ppc64le | — |
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| Unresolved product id: AppStream-9.4.0.Z.E4S:pam_ssh_agent_auth-debuginfo-0:0.10.4-5.38.el9_4.10.x86_64 | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-askpass-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.ppc64le | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-clients-debuginfo-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.s390x | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-debugsource-0:8.7p1-38.el9_4.10.x86_64 | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.aarch64 | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.ppc64le | — |
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| Unresolved product id: BaseOS-9.4.0.Z.E4S:openssh-keycat-0:8.7p1-38.el9_4.10.x86_64 | — |
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Threats
Impact
Important
A flaw was found in OpenSSH. A remote attacker could exploit a use-after-free vulnerability on the client side when a server changes its host key during a key re-exchange. This could lead to high impact on confidentiality and integrity, and low impact on availability.
7.7 (High)
Affected products
Fixed
4 products, the same list as for
CVE-2026-55653
Known not affected
85 products, the same list as for
CVE-2026-55653
Threats
Impact
Important
References
36 references
{
"document": {
"aggregate_severity": {
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"text": "Important"
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"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
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"lang": "en",
"notes": [
{
"category": "summary",
"text": "An update for openssh is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
"title": "Topic"
},
{
"category": "general",
"text": "OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.\n\nSecurity Fix(es):\n\n* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions (CVE-2026-55655)\n\n* openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n\n* openssh: OpenSSH: sftp client allows attacker to control downloaded file location (CVE-2026-59995)\n\n* openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)\n\n* openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options (CVE-2026-59999)\n\n* openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
"title": "Details"
},
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
"title": "Terms of Use"
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{
"system_name": "Red Hat Bugzilla ID",
"text": "2462351"
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{
"category": "description",
"text": "A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate flaw in OpenSSH affects clients operating in FIPS mode when negotiating Diffie-Hellman Group Exchange (DH-GEX) with a malicious SSH server. While it can lead to client process termination, resulting in a denial of service, the impact is limited to availability and does not result in broader system compromise. In order to exploit this vulnerability the attacker needs to trick the user to connect to an untrusted malicious server or compromise the server first. The availability impact is considered Low as the only impacted process is the single run of the SSH client trying to connect to the malicious server.\n\nThis vulnerability affects only the OpenSSH versions shipped with Red Hat products.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-55653"
},
{
"category": "external",
"summary": "RHBZ#2462351",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462351"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-55653",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55653"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-55653",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55653"
}
],
"release_date": "2026-06-22T23:17:43.088000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-07T02:20:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:76993"
},
{
"category": "workaround",
"details": "To mitigate this issue, OpenSSH clients operating in FIPS mode should avoid negotiating the `diffie-hellman-group-exchange-sha256` key exchange algorithm. This can be achieved by explicitly listing allowed key exchange algorithms in the client\u0027s SSH configuration file (e.g., `/etc/ssh/ssh_config` or `~/.ssh/config`), ensuring `diffie-hellman-group-exchange-sha256` is *not* included. For example, to use a subset of common algorithms, you might configure:\n\n```\nKexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1\n```\n\n(Note: The above example `KexAlgorithms` list is illustrative and should be adjusted based on your environment\u0027s security requirements.)\n\nAdditionally, avoid using non-fatal client flows, such as `ssh-keyscan`, against untrusted SSH servers while FIPS mode is enabled. Changes to `ssh_config` will take effect for new SSH connections.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service"
},
{
"acknowledgments": [
{
"organization": "Aisle.com",
"summary": "This issue was discovered by Red Hat."
}
],
"cve": "CVE-2026-55655",
"cwe": {
"id": "CWE-923",
"name": "Improper Restriction of Communication Channel to Intended Endpoints"
},
"discovery_date": "2026-04-26T18:39:13+00:00",
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{
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2462250"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is a Moderate severity flaw. The OpenSSH client in Red Hat Enterprise Linux is vulnerable to a local man-in-the-middle attack on X11 forwarding connections. Exploitation requires an attacker to have local unprivileged access on the client system and for X11 forwarding to be explicitly enabled and in use, which is not a default configuration. The attack can compromise the confidentiality of forwarded X11 traffic. This vulnerability doesn\u0027t affect the upstream OpenSSH versions and is restricted to the versions as shipped with Red Hat Enterprise Linux.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-55655"
},
{
"category": "external",
"summary": "RHBZ#2462250",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462250"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-55655",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55655"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-55655",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55655"
}
],
"release_date": "2026-06-22T23:22:11.127000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-07T02:20:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:76993"
},
{
"category": "workaround",
"details": "To mitigate this issue, disable X11 forwarding on OpenSSH clients when it is not required. This can be achieved by avoiding the use of `-X` or `-Y` options when invoking `ssh`, or by setting `ForwardX11 no` in the SSH client configuration file (`~/.ssh/config` or `/etc/ssh/ssh_config`). Disabling X11 forwarding will prevent the client from attempting to establish X11 connections, thereby removing the attack vector.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N",
"version": "3.1"
},
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions"
},
{
"cve": "CVE-2026-59995",
"cwe": {
"id": "CWE-22",
"name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
},
"discovery_date": "2026-07-08T01:01:01.518880+00:00",
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2497927"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in OpenSSH. The `sftp` client, when used to download files from a malicious server with the \u0027sftp server:/path .\u0027 command, does not properly restrict where those files are saved. This allows an attacker to control the download location, potentially overwriting existing files or placing malicious files in sensitive directories on the client system, which could compromise system integrity.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssh: OpenSSH: sftp client allows attacker to control downloaded file location",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-59995"
},
{
"category": "external",
"summary": "RHBZ#2497927",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497927"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-59995",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-59995"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-59995",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59995"
},
{
"category": "external",
"summary": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2",
"url": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2"
},
{
"category": "external",
"summary": "https://www.openssh.org/releasenotes.html#10.4p1",
"url": "https://www.openssh.org/releasenotes.html#10.4p1"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2026/07/06/5",
"url": "https://www.openwall.com/lists/oss-security/2026/07/06/5"
}
],
"release_date": "2026-07-08T00:04:49.995000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-07T02:20:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:76993"
},
{
"category": "workaround",
"details": "To mitigate this issue, avoid using the `sftp server:/path .` command when connecting to untrusted or potentially malicious SFTP servers. Exercise caution and verify the authenticity of SFTP servers before initiating file transfers, especially when using commands that implicitly define the download destination, and also avoid running SFTP sessions with elevated privileges (such as root).",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "openssh: OpenSSH: sftp client allows attacker to control downloaded file location"
},
{
"cve": "CVE-2026-59996",
"cwe": {
"id": "CWE-22",
"name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
},
"discovery_date": "2026-07-08T01:02:02.730076+00:00",
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2497944"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in OpenSSH, a widely used tool for secure remote access. When a user attempts to copy files between two different remote systems using the `scp` command, the file might be incorrectly placed in a directory above the intended destination. This unintended file placement could lead to data integrity issues or, in some cases, unauthorized access to sensitive information if files are stored in an exposed location.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Conditions for Exploitation: Exploitation requires specific user actions and conditions, as the vulnerability only triggers when a user explicitly initiates a file copy between two remote destinations using the scp command. \n\nImpact Limitations: The boundaries of the potential impact are highly contained. The flaw only results in unintended file placement within the parent directory of the target destination. It does not inherently lead to arbitrary code execution, denial of service, or privilege escalation, and any potential data exposure relies heavily on the existing permissions of the parent directory.\n\nRed Hat Enterprise Linux (RHEL) versions 6, 7, and 8 are not affected by this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-59996"
},
{
"category": "external",
"summary": "RHBZ#2497944",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497944"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-59996",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-59996"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-59996",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59996"
},
{
"category": "external",
"summary": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2",
"url": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2"
},
{
"category": "external",
"summary": "https://www.openssh.org/releasenotes.html#10.4p1",
"url": "https://www.openssh.org/releasenotes.html#10.4p1"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2026/07/06/5",
"url": "https://www.openwall.com/lists/oss-security/2026/07/06/5"
}
],
"release_date": "2026-07-08T00:07:07.759000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-07T02:20:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:76993"
},
{
"category": "workaround",
"details": "To mitigate this issue, users should avoid performing `scp` operations directly between two remote destinations. Instead, consider copying files from the first remote host to a local machine, and then from the local machine to the second remote host. Alternatively, use `sftp` or `rsync` for remote file transfers, as these utilities are not affected by this specific vulnerability.",
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"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy"
},
{
"cve": "CVE-2026-59999",
"cwe": {
"id": "CWE-358",
"name": "Improperly Implemented Security Check for Standard"
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"discovery_date": "2026-07-08T01:01:55.619428+00:00",
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2497942"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in `sshd`, the OpenSSH server daemon. When `DisableForwarding=yes` is configured to prevent network traffic forwarding, it incorrectly fails to take precedence over `PermitTunnel=yes`. This allows a remote attacker to bypass intended security restrictions and establish a tunnel, potentially leading to unauthorized network access or circumvention of security policies, even when forwarding is explicitly disabled.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate severity flaw in OpenSSH `sshd` allows `PermitTunnel=yes` to override `DisableForwarding=yes`, potentially bypassing intended security controls. In Red Hat environments where `DisableForwarding` is used to restrict SSH session capabilities, an attacker who compromises a user\u0027s session could still establish a tunnel, leading to unauthorized network access or data exfiltration. This bypass occurs even when administrators explicitly attempt to prevent forwarding, though `PermitTunnel` is not enabled by default.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-59999"
},
{
"category": "external",
"summary": "RHBZ#2497942",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497942"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-59999",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-59999"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-59999",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59999"
},
{
"category": "external",
"summary": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2",
"url": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2"
},
{
"category": "external",
"summary": "https://www.openssh.org/releasenotes.html#10.4p1",
"url": "https://www.openssh.org/releasenotes.html#10.4p1"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2026/07/06/5",
"url": "https://www.openwall.com/lists/oss-security/2026/07/06/5"
}
],
"release_date": "2026-07-08T00:13:08.397000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-07T02:20:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:76993"
},
{
"category": "workaround",
"details": "To mitigate this issue, if `DisableForwarding=yes` is set in `/etc/ssh/sshd_config` to prevent all forwarding, ensure that `PermitTunnel` is explicitly set to `no` in the same configuration file. This will enforce the intended security policy.\n\nAfter modifying `/etc/ssh/sshd_config`, restart the `sshd` service for the changes to take effect. This may temporarily interrupt active SSH sessions.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options"
},
{
"cve": "CVE-2026-60002",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-07-08T01:01:33.808610+00:00",
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{
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2497936"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in OpenSSH. A remote attacker could exploit a use-after-free vulnerability on the client side when a server changes its host key during a key re-exchange. This could lead to high impact on confidentiality and integrity, and low impact on availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important flaw in OpenSSH client could allow a malicious SSH server to execute arbitrary code on the connecting client due to a use-after-free vulnerability during host key re-exchange. While requiring a connection to a specially crafted server, the potential for high impact on client confidentiality and integrity elevates the severity beyond Moderate.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-60002"
},
{
"category": "external",
"summary": "RHBZ#2497936",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497936"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-60002",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-60002"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-60002",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-60002"
},
{
"category": "external",
"summary": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2",
"url": "https://marc.info/?l=openssh-unix-dev\u0026m=178333966933090\u0026w=2"
},
{
"category": "external",
"summary": "https://www.openssh.org/releasenotes.html#10.4p1",
"url": "https://www.openssh.org/releasenotes.html#10.4p1"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2026/07/06/5",
"url": "https://www.openwall.com/lists/oss-security/2026/07/06/5"
}
],
"release_date": "2026-07-08T00:17:33.058000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-07T02:20:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:76993"
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"category": "workaround",
"details": "To mitigate this issue, OpenSSH clients should only connect to trusted SSH servers. Enforcing strict host key checking and carefully managing `known_hosts` files can help prevent connections to servers with unexpected or altered host keys, thereby reducing exposure to this client-side vulnerability.",
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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