RHSA-2026:72506

Vulnerability from csaf_redhat - Published: 2026-09-28 15:15 - Updated: 2026-09-29 00:24
Summary
Red Hat Security Advisory: curl security update
Severity
Important
Notes
Topic: An update for curl is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. 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: The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP. Security Fix(es): * curl: libcurl: Improper certificate validation due to cached TLS settings reuse (CVE-2025-14819) * curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965) * curl: curl: Unauthorized access due to improper HTTP proxy connection reuse (CVE-2026-3784) * curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783) * curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547) * libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse (CVE-2026-8932) * curl: curl: Information disclosure via incorrect .netrc password lookup (CVE-2026-8926) * curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286) * curl: libcurl: Unauthorized connection reuse due to a logical error (CVE-2026-8458) * curl: curl: Cookie injection via malicious HTTP server using super cookies (CVE-2026-8924) * curl: curl: Information disclosure via incorrect Digest authentication header reuse (CVE-2026-11856) * curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP (CVE-2026-12064) * curl: Information disclosure due to uncleared proxy authentication state (CVE-2026-8927) * libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials (CVE-2026-9079) 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.
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CVE-2025-14819

A flaw was found in libcurl. When handling secure connections (TLS) and reusing connection settings, libcurl could incorrectly apply a cached security setting related to certificate chain validation. This could allow libcurl to accept a server's security certificate that it should have otherwise rejected, potentially compromising the integrity of the secure connection.

6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE-295 - Improper Certificate Validation
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-devel-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-devel-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-devel-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-devel-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-0:8.12.1-1.el10_0.10.src —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debuginfo-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:curl-debugsource-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-debuginfo-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.aarch64 —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.ppc64le —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.s390x —
Vendor Fix fix
Unresolved product id: BaseOS-10.0.Z.E2S:libcurl-minimal-debuginfo-0:8.12.1-1.el10_0.10.x86_64 —
Vendor Fix fix
Threats
Impact Low
CVE-2026-1965

A flaw was found in curl. When an application uses libcurl to make multiple Negotiate-authenticated HTTP or HTTPS requests to the same server with different credentials, libcurl may incorrectly reuse an existing connection. This logical error can cause a subsequent request to be sent using the authentication of a previous user, leading to an authentication bypass.

6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-303 - Incorrect Implementation of Authentication Algorithm
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-3783

A flaw was found in curl. When an OAuth2 bearer token is used for an HTTP(S) transfer that redirects to a second URL, curl could unintentionally leak the token. This occurs if the second hostname has entries in the `.netrc` file, allowing the bearer token intended for the first host to be sent to the redirected host. This information disclosure could allow an attacker to gain unauthorized access.

5.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-3784

A flaw was found in curl. This vulnerability allows curl to wrongly reuse an existing HTTP proxy connection when performing a CONNECT request to a server, even if the new request uses different authentication credentials for the HTTP proxy. This improper connection reuse could lead to an attacker gaining unauthorized access to resources or information intended for a different user.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE-305 - Authentication Bypass by Primary Weakness
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-8286

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security (TLS) configuration of the new transfer does not match the existing connection, potentially leading to an insecure connection being established.

8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE-295 - Improper Certificate Validation
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Important
CVE-2026-8458

A flaw was found in libcurl. A logical error in the connection pooling mechanism may cause libcurl to reuse an authenticated connection for an unintended service. This could allow an application to wrongfully reuse an existing connection to the same server that was authenticated for a different service, potentially leading to unauthorized access or information disclosure.

8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-305 - Authentication Bypass by Primary Weakness
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Important
CVE-2026-8924

A flaw was found in curl's cookie parsing logic. A malicious HTTP server can exploit this by setting 'super cookies' that bypass the Public Suffix List check. This allows an attacker-controlled origin to inject cookies that curl then transmits to unrelated third-party domains, leading to compromising request integrity.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-8926

A flaw was found in curl. When curl is configured to use a .netrc file for credentials and a URL is provided with a username but no password, curl may incorrectly retrieve and use the password for a different user from the .netrc file for the same host. This could lead to unauthorized information disclosure, as curl might connect using unintended credentials.

4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
CWE-289 - Authentication Bypass by Alternate Name
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-8927

A flaw was found in libcurl. When reusing a libcurl handle for sequential transfers with environment-variable proxy configuration, the library does not properly clear the proxy authentication state. This oversight can lead to the unintended disclosure of `Proxy-Authorization` headers to an incorrect proxy, potentially exposing sensitive authentication information to an unauthorized entity. This is an information disclosure vulnerability.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Important
CVE-2026-8932

A flaw was found in curl. The libcurl library, used for transferring data with URLs, could improperly reuse existing network connections. This occurred even when changes to mutual Transport Layer Security (mTLS) settings, particularly those for client certificates, should have prevented such reuse. This issue could lead to a security feature bypass, where a client might use a connection with an unintended or weaker security configuration, potentially compromising the integrity or confidentiality of data.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-1025 - Comparison Using Wrong Factors
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-9079

A flaw was found in curl. When libcurl is instructed to clear proxy authentication credentials, it fails to do so, leaving the old credentials available. This could lead to the unintended reuse of sensitive proxy authentication credentials for subsequent network transfers, potentially resulting in unauthorized access or information disclosure.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-212 - Improper Removal of Sensitive Information Before Storage or Transfer
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-9547

A flaw was found in curl. When a libcurl-based application uses SCP:// or SFTP:// for transfers and employs the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This occurs if the server's host key type differs from the one stored in the known_hosts file. The callback mechanism fails to enforce the host key restriction, enabling a connection to an untrusted server and risking a man-in-the-middle attack.

7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-347 - Improper Verification of Cryptographic Signature
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Important
CVE-2026-11856

A flaw was found in curl. When `libcurl` performs a transfer to an HTTP origin using Digest authentication and then reuses the same connection handle for a subsequent transfer to a different origin, it may incorrectly send the authentication header intended for the first origin to the second. This could lead to unintended information disclosure, potentially allowing an attacker to gain unauthorized access to sensitive data.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Moderate
CVE-2026-12064

A flaw was found in curl. When a user invokes curl with a schemeless URL and specifies SFTP (SSH File Transfer Protocol) or SCP (Secure Copy Protocol) as the default protocol, the tool layer fails to initialize critical SSH security options. This bypasses host verification, allowing curl to connect to an unverified SSH remote host without alerting the user. This could enable an attacker to intercept or manipulate data through a man-in-the-middle attack.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-358 - Improperly Implemented Security Check for Standard
Affected products
Fixed 49 products, the same list as for CVE-2025-14819
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:72506 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2426408 external
https://bugzilla.redhat.com/show_bug.cgi?id=2446448 external
https://bugzilla.redhat.com/show_bug.cgi?id=2446449 external
https://bugzilla.redhat.com/show_bug.cgi?id=2446450 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496758 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496759 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496760 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496763 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496764 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496765 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496767 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496768 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496769 external
https://bugzilla.redhat.com/show_bug.cgi?id=2496771 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2025-14819 self
https://bugzilla.redhat.com/show_bug.cgi?id=2426408 external
https://www.cve.org/CVERecord?id=CVE-2025-14819 external
https://nvd.nist.gov/vuln/detail/CVE-2025-14819 external
https://curl.se/docs/CVE-2025-14819.html external
https://access.redhat.com/security/cve/CVE-2026-1965 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446448 external
https://www.cve.org/CVERecord?id=CVE-2026-1965 external
https://nvd.nist.gov/vuln/detail/CVE-2026-1965 external
https://curl.se/docs/CVE-2026-1965.html external
https://curl.se/docs/CVE-2026-1965.json external
https://access.redhat.com/security/cve/CVE-2026-3783 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446450 external
https://www.cve.org/CVERecord?id=CVE-2026-3783 external
https://nvd.nist.gov/vuln/detail/CVE-2026-3783 external
http://www.openwall.com/lists/oss-security/2026/03/11/2 external
https://curl.se/docs/CVE-2026-3783.html external
https://curl.se/docs/CVE-2026-3783.json external
https://hackerone.com/reports/3583983 external
https://access.redhat.com/security/cve/CVE-2026-3784 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446449 external
https://www.cve.org/CVERecord?id=CVE-2026-3784 external
https://nvd.nist.gov/vuln/detail/CVE-2026-3784 external
http://www.openwall.com/lists/oss-security/2026/03/11/3 external
https://curl.se/docs/CVE-2026-3784.html external
https://curl.se/docs/CVE-2026-3784.json external
https://hackerone.com/reports/3584903 external
https://access.redhat.com/security/cve/CVE-2026-8286 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496763 external
https://www.cve.org/CVERecord?id=CVE-2026-8286 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8286 external
https://curl.se/docs/CVE-2026-8286.html external
https://curl.se/docs/CVE-2026-8286.json external
https://hackerone.com/reports/3718195 external
https://access.redhat.com/security/cve/CVE-2026-8458 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496764 external
https://www.cve.org/CVERecord?id=CVE-2026-8458 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8458 external
https://curl.se/docs/CVE-2026-8458.html external
https://curl.se/docs/CVE-2026-8458.json external
https://hackerone.com/reports/3721183 external
https://access.redhat.com/security/cve/CVE-2026-8924 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496765 external
https://www.cve.org/CVERecord?id=CVE-2026-8924 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8924 external
https://curl.se/docs/CVE-2026-8924.html external
https://curl.se/docs/CVE-2026-8924.json external
https://hackerone.com/reports/3733905 external
https://access.redhat.com/security/cve/CVE-2026-8926 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496760 external
https://www.cve.org/CVERecord?id=CVE-2026-8926 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8926 external
https://curl.se/docs/CVE-2026-8926.html external
https://curl.se/docs/CVE-2026-8926.json external
https://hackerone.com/reports/3735184 external
https://access.redhat.com/security/cve/CVE-2026-8927 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496769 external
https://www.cve.org/CVERecord?id=CVE-2026-8927 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8927 external
https://curl.se/docs/CVE-2026-8927.html external
https://curl.se/docs/CVE-2026-8927.json external
https://hackerone.com/reports/3744543 external
https://access.redhat.com/security/cve/CVE-2026-8932 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496759 external
https://www.cve.org/CVERecord?id=CVE-2026-8932 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8932 external
https://curl.se/docs/CVE-2026-8932.html external
https://curl.se/docs/CVE-2026-8932.json external
https://hackerone.com/reports/3733910 external
https://access.redhat.com/security/cve/CVE-2026-9079 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496771 external
https://www.cve.org/CVERecord?id=CVE-2026-9079 external
https://nvd.nist.gov/vuln/detail/CVE-2026-9079 external
https://curl.se/docs/CVE-2026-9079.html external
https://curl.se/docs/CVE-2026-9079.json external
https://hackerone.com/reports/3750295 external
https://access.redhat.com/security/cve/CVE-2026-9547 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496758 external
https://www.cve.org/CVERecord?id=CVE-2026-9547 external
https://nvd.nist.gov/vuln/detail/CVE-2026-9547 external
https://curl.se/docs/CVE-2026-9547.html external
https://curl.se/docs/CVE-2026-9547.json external
https://hackerone.com/reports/3751712 external
https://access.redhat.com/security/cve/CVE-2026-11856 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496767 external
https://www.cve.org/CVERecord?id=CVE-2026-11856 external
https://nvd.nist.gov/vuln/detail/CVE-2026-11856 external
https://curl.se/docs/CVE-2026-11856.html external
https://curl.se/docs/CVE-2026-11856.json external
https://hackerone.com/reports/3793260 external
https://access.redhat.com/security/cve/CVE-2026-12064 self
https://bugzilla.redhat.com/show_bug.cgi?id=2496768 external
https://www.cve.org/CVERecord?id=CVE-2026-12064 external
https://nvd.nist.gov/vuln/detail/CVE-2026-12064 external
https://curl.se/docs/CVE-2026-12064.html external
https://curl.se/docs/CVE-2026-12064.json external
https://hackerone.com/reports/3797526 external
To clipboard 

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        "text": "An update for curl is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.\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.",
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          "text": "This vulnerability is rated Low for Red Hat. `libcurl` could incorrectly reuse a cached CA store when applications alter the `CURLSSLOPT_NO_PARTIALCHAIN` option with re-used easy or multi handles. This could lead to the acceptance of an otherwise untrusted TLS trust chain. Exploitation requires specific application logic that dynamically changes this option while reusing `libcurl` handles.",
          "title": "Statement"
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          "text": "curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication",
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      "cve": "CVE-2026-3783",
      "cwe": {
        "id": "CWE-201",
        "name": "Insertion of Sensitive Information Into Sent Data"
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      "discovery_date": "2026-03-11T11:01:01.429907+00:00",
      "ids": [
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          "text": "2446450"
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          "category": "description",
          "text": "A flaw was found in curl. When an OAuth2 bearer token is used for an HTTP(S) transfer that redirects to a second URL, curl could unintentionally leak the token. This occurs if the second hostname has entries in the `.netrc` file, allowing the bearer token intended for the first host to be sent to the redirected host. This information disclosure could allow an attacker to gain unauthorized access.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect",
          "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.",
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          "details": "Moderate"
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      "title": "curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect"
    },
    {
      "cve": "CVE-2026-3784",
      "cwe": {
        "id": "CWE-305",
        "name": "Authentication Bypass by Primary Weakness"
      },
      "discovery_date": "2026-03-11T11:00:57.752827+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2446449"
        }
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        {
          "category": "description",
          "text": "A flaw was found in curl. This vulnerability allows curl to wrongly reuse an existing HTTP proxy connection when performing a CONNECT request to a server, even if the new request uses different authentication credentials for the HTTP proxy. This improper connection reuse could lead to an attacker gaining unauthorized access to resources or information intended for a different user.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Unauthorized access due to improper HTTP proxy connection reuse",
          "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"
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          "url": "https://access.redhat.com/security/cve/CVE-2026-3784"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-3784",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3784"
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        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/03/11/3",
          "url": "http://www.openwall.com/lists/oss-security/2026/03/11/3"
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          "category": "external",
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          "category": "external",
          "summary": "https://hackerone.com/reports/3584903",
          "url": "https://hackerone.com/reports/3584903"
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          "text": "A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security (TLS) configuration of the new transfer does not match the existing connection, potentially leading to an insecure connection being established.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "curl: curl: Insecure connection establishment due to TLS configuration mismatch",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "This is an Important flaw as `curl` may establish an insecure connection when attempting to upgrade a transfer with STARTTLS, potentially reusing an existing connection with mismatched TLS configurations. This could lead to unexpected data exposure or compromise, particularly in environments where `curl` is used for sensitive data transfers and relies on STARTTLS for security.",
          "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.",
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          "text": "This is an Important flaw in libcurl where a logical error in connection pooling can lead to unauthorized connection reuse. When an application uses Negotiate authentication with different service names on the same hostname and port, libcurl might incorrectly reuse an existing authenticated connection for an unintended service. This could result in information disclosure or unauthorized access to resources, bypassing intended service isolation.",
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      "cwe": {
        "id": "CWE-565",
        "name": "Reliance on Cookies without Validation and Integrity Checking"
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          "category": "description",
          "text": "A flaw was found in curl\u0027s cookie parsing logic. A malicious HTTP server can exploit this by setting \u0027super cookies\u0027 that bypass the Public Suffix List check. This allows an attacker-controlled origin to inject cookies that curl then transmits to unrelated third-party domains, leading to compromising request integrity.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "curl: curl: Cookie injection via malicious HTTP server using super cookies",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "Moderate: Red Hat rates this flaw Moderate (CVSS 6.5) compared to CISA\u0027s Critical (9.1). The scoring difference is due to two factors: first, exploitation requires the victim\u0027s curl to connect using a trailing-dot hostname (e.g., https://example.co.uk.), a format that is uncommon in practice and incompatible with TLS SNI; second, the direct impact is cookie injection into outbound requests \u2014 not exfiltration of victim data to the attacker. The curl project itself rates this flaw Low severity. Red Hat products that use curl for HTTP communication are affected, but the trailing-dot precondition significantly limits real-world exploitability. This flaw has not been shown to enable impacts beyond session integrity modification.",
          "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.",
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          "date": "2026-09-28T15:15:24+00:00",
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      "title": "curl: curl: Cookie injection via malicious HTTP server using super cookies"
    },
    {
      "cve": "CVE-2026-8926",
      "cwe": {
        "id": "CWE-289",
        "name": "Authentication Bypass by Alternate Name"
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      "discovery_date": "2026-07-03T07:01:18.157468+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2496760"
        }
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        {
          "category": "description",
          "text": "A flaw was found in curl. When curl is configured to use a .netrc file for credentials and a URL is provided with a username but no password, curl may incorrectly retrieve and use the password for a different user from the .netrc file for the same host. This could lead to unauthorized information disclosure, as curl might connect using unintended credentials.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Information disclosure via incorrect .netrc password lookup",
          "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"
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          "url": "https://access.redhat.com/security/cve/CVE-2026-8926"
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          "category": "external",
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          "category": "external",
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          "category": "external",
          "summary": "https://hackerone.com/reports/3735184",
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      "cve": "CVE-2026-8927",
      "cwe": {
        "id": "CWE-201",
        "name": "Insertion of Sensitive Information Into Sent Data"
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      "ids": [
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          "text": "2496769"
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          "category": "description",
          "text": "A flaw was found in libcurl. When reusing a libcurl handle for sequential transfers with environment-variable proxy configuration, the library does not properly clear the proxy authentication state. This oversight can lead to the unintended disclosure of `Proxy-Authorization` headers to an incorrect proxy, potentially exposing sensitive authentication information to an unauthorized entity. This is an information disclosure vulnerability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: Information disclosure due to uncleared proxy authentication state",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important information disclosure vulnerability in libcurl arises when a handle is reused for sequential transfers with environment-variable proxy configurations, failing to clear the proxy authentication state. This oversight can lead to `Proxy-Authorization` headers being inadvertently sent to an incorrect proxy, potentially exposing sensitive authentication information in Red Hat environments utilizing multiple proxy configurations. This flaw leads only to a confidentiality impact. There has been no observed integrity impact.",
          "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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          "text": "A flaw was found in curl. The libcurl library, used for transferring data with URLs, could improperly reuse existing network connections. This occurred even when changes to mutual Transport Layer Security (mTLS) settings, particularly those for client certificates, should have prevented such reuse. This issue could lead to a security feature bypass, where a client might use a connection with an unintended or weaker security configuration, potentially compromising the integrity or confidentiality of data.",
          "title": "Vulnerability description"
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          "text": "libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse",
          "title": "Vulnerability summary"
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          "text": "This is an Important security feature bypass in libcurl where mTLS connection reuse may occur despite changes to client certificate settings. This could lead to applications using libcurl with mTLS to inadvertently use a less secure connection than intended, potentially compromising data confidentiality or integrity. This issue primarily affects applications that dynamically alter mTLS client certificate configurations and reuse connections.",
          "title": "Statement"
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          "category": "general",
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          "text": "A flaw was found in curl. When libcurl is instructed to clear proxy authentication credentials, it fails to do so, leaving the old credentials available. This could lead to the unintended reuse of sensitive proxy authentication credentials for subsequent network transfers, potentially resulting in unauthorized access or information disclosure.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Important: A flaw in libcurl\u0027s proxy authentication credential management can lead to information disclosure. There are no integrity or availability risks posed by this flaw.",
          "title": "Statement"
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          "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.",
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      "title": "libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials"
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    {
      "cve": "CVE-2026-9547",
      "cwe": {
        "id": "CWE-347",
        "name": "Improper Verification of Cryptographic Signature"
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      "discovery_date": "2026-07-03T07:01:12.182841+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2496758"
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          "category": "description",
          "text": "A flaw was found in curl. When a libcurl-based application uses SCP:// or SFTP:// for transfers and employs the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This occurs if the server\u0027s host key type differs from the one stored in the known_hosts file. The callback mechanism fails to enforce the host key restriction, enabling a connection to an untrusted server and risking a man-in-the-middle attack.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Man-in-the-middle attack via SSH host key bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw where libcurl-based applications performing SCP or SFTP transfers with the CURLOPT_SSH_KEYFUNCTION callback may silently accept an untrusted server. This occurs when a server presents a host key type that differs from the one recorded in the known_hosts file, bypassing a critical host key verification and enabling potential man-in-the-middle attacks. The vulnerability requires specific application callback usage, not a general curl client 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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          "category": "external",
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          "category": "external",
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          "category": "external",
          "summary": "https://hackerone.com/reports/3751712",
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            "integrityImpact": "HIGH",
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        {
          "category": "impact",
          "details": "Important"
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      "title": "curl: curl: Man-in-the-middle attack via SSH host key bypass"
    },
    {
      "cve": "CVE-2026-11856",
      "cwe": {
        "id": "CWE-201",
        "name": "Insertion of Sensitive Information Into Sent Data"
      },
      "discovery_date": "2026-07-03T07:01:38.848109+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2496767"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in curl. When `libcurl` performs a transfer to an HTTP origin using Digest authentication and then reuses the same connection handle for a subsequent transfer to a different origin, it may incorrectly send the authentication header intended for the first origin to the second. This could lead to unintended information disclosure, potentially allowing an attacker to gain unauthorized access to sensitive data.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Information disclosure via incorrect Digest authentication header reuse",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate-severity flaw in `libcurl` can lead to information disclosure when an application reuses a `libcurl` handle for transfers to different HTTP origins while using Digest authentication. The vulnerability arises from `libcurl` incorrectly sending the authentication header intended for the initial origin to a subsequent, different origin. This could expose sensitive authentication data to an unintended recipient, potentially compromising user credentials or session information. The only observed impact from this flaw is an integrity impact.\n\n- libcurl only \u2014 the curl CLI is not affected\n- Requires an application to reuse an easy handle across different HTTP origins while Digest auth state is attached \u2014 a specific programming pattern\n- Credentials themselves are not leaked; only the authenticated state (\"Authorization: ...\" HTTP header)\n- Fixed in curl 8.21.0; affected range: 7.10.6 \u2013 8.20.0",
          "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-11856"
        },
        {
          "category": "external",
          "summary": "RHBZ#2496767",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496767"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-11856",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-11856"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11856",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11856"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-11856.html",
          "url": "https://curl.se/docs/CVE-2026-11856.html"
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          "url": "https://curl.se/docs/CVE-2026-11856.json"
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        {
          "category": "external",
          "summary": "https://hackerone.com/reports/3793260",
          "url": "https://hackerone.com/reports/3793260"
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      "release_date": "2026-07-03T06:13:31.661000+00:00",
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          "date": "2026-09-28T15:15:24+00:00",
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      "cve": "CVE-2026-12064",
      "cwe": {
        "id": "CWE-358",
        "name": "Improperly Implemented Security Check for Standard"
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          "text": "2496768"
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          "category": "description",
          "text": "A flaw was found in curl. When a user invokes curl with a schemeless URL and specifies SFTP (SSH File Transfer Protocol) or SCP (Secure Copy Protocol) as the default protocol, the tool layer fails to initialize critical SSH security options. This bypasses host verification, allowing curl to connect to an unverified SSH remote host without alerting the user. This could enable an attacker to intercept or manipulate data through a man-in-the-middle attack.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important flaw in curl allows an attacker to bypass SSH host verification when a user invokes curl with a schemeless URL and specifies SFTP or SCP as the default protocol. This can lead to man-in-the-middle attacks, enabling data interception or manipulation without user awareness in Red Hat environments.",
          "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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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:72506"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, avoid using the `--proto-default sftp` or `--proto-default scp` options with schemeless URLs when invoking the `curl` command. Instead, explicitly specify the protocol in the URL (e.g., `sftp://host/path` or `scp://host/path`).",
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      "scores": [
        {
          "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": "curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP"
    }
  ]
}



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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.



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.