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21 vulnerabilities by libssh2
CVE-2026-58051 (GCVE-0-2026-58051)
Vulnerability from cvelistv5 – Published: 2026-06-28 01:32 – Updated: 2026-06-28 01:32
VLAI
Title
libssh2 - Free of Uninitialized Pointer in publickey List Cleanup
Summary
libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.
Severity
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/bikini/exploitarium/tree/main/… | exploitthird-party-advisory |
| https://github.com/libssh2/libssh2/blob/master/sr… | product |
| https://www.vulncheck.com/advisories/libssh2-free… | third-party-advisory |
Date Public
2026-06-25 00:00
Credits
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CVE-2026-58050 (GCVE-0-2026-58050)
Vulnerability from cvelistv5 – Published: 2026-06-28 01:32 – Updated: 2026-06-28 01:32
VLAI
Title
libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation
Summary
libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.
Severity
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/bikini/exploitarium/tree/main/… | exploitthird-party-advisory |
| https://github.com/libssh2/libssh2/blob/master/sr… | product |
| https://www.vulncheck.com/advisories/libssh2-inte… | third-party-advisory |
Date Public
2026-06-25 00:00
Credits
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CVE-2025-15661 (GCVE-0-2025-15661)
Vulnerability from cvelistv5 – Published: 2026-06-18 20:18 – Updated: 2026-06-23 16:13 X_Open Source
VLAI
Title
libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.c
Summary
libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the missing validation of available packet buffer size before the memcpy operation.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/libssh2/libssh2/pull/1705 | issue-tracking |
| https://github.com/libssh2/libssh2/pull/1717 | issue-tracking |
| https://github.com/libssh2/libssh2/commit/2dae302… | patch |
| https://www.vulncheck.com/advisories/libssh2-heap… | third-party-advisory |
Impacted products
Date Public
2025-10-06 00:00
Credits
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CVE-2026-55200 (GCVE-0-2026-55200)
Vulnerability from cvelistv5 – Published: 2026-06-17 19:03 – Updated: 2026-06-25 03:55 X_Open Source
VLAI
Title
libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c
Summary
libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-680 - Integer Overflow to Buffer Overflow
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/libssh2/libssh2/pull/2052 | issue-tracking |
| https://github.com/libssh2/libssh2/commit/97acf3d… | patch |
| https://www.vulncheck.com/advisories/libssh2-out-… | third-party-advisory |
| https://github.com/bikini/exploitarium/tree/main/… | exploit |
Impacted products
Date Public
2026-06-12 00:00
Credits
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CVE-2026-55199 (GCVE-0-2026-55199)
Vulnerability from cvelistv5 – Published: 2026-06-17 18:44 – Updated: 2026-06-18 15:31 X_Open Source
VLAI
Title
libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler
Summary
libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/libssh2/libssh2/pull/1864 | issue-tracking |
| https://github.com/libssh2/libssh2/commit/1762685… | patch |
| https://www.vulncheck.com/advisories/libssh2-pre-… | third-party-advisory |
Impacted products
Date Public
2026-04-15 00:00
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CVE-2026-7598 (GCVE-0-2026-7598)
Vulnerability from cvelistv5 – Published: 2026-05-01 21:30 – Updated: 2026-05-04 13:31 X_Open Source
VLAI
Title
libssh2 userauth.c userauth_password integer overflow
Summary
A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/360555 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/360555/cti | signaturepermissions-required |
| https://vuldb.com/submit/805564 | third-party-advisory |
| https://github.com/libssh2/libssh2/pull/1858 | issue-trackingpatch |
| https://github.com/libssh2/libssh2/commit/256d04b… | patch |
| https://github.com/libssh2/libssh2/ | product |
Impacted products
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CVE-2023-48795 (GCVE-0-2023-48795)
Vulnerability from cvelistv5 – Published: 2023-12-18 00:00 – Updated: 2026-05-12 11:02
VLAI
Summary
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
139 references
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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CVE-2020-22218 (GCVE-0-2020-22218)
Vulnerability from cvelistv5 – Published: 2023-08-22 00:00 – Updated: 2024-10-03 18:09
VLAI
Summary
An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out of bounds memory.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
Assigner
References
3 references
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CVE-2019-17498 (GCVE-0-2019-17498)
Vulnerability from cvelistv5 – Published: 2019-10-21 00:00 – Updated: 2024-08-05 01:40
VLAI
Summary
In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
12 references
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CVE-2019-13115 (GCVE-0-2019-13115)
Vulnerability from cvelistv5 – Published: 2019-07-16 00:00 – Updated: 2024-08-04 23:41
VLAI
Summary
In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
15 references
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CVE-2019-3856 (GCVE-0-2019-3856)
Vulnerability from cvelistv5 – Published: 2019-03-25 18:31 – Updated: 2025-04-23 19:48
VLAI
Summary
An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
|
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CVE-2019-3857 (GCVE-0-2019-3857)
Vulnerability from cvelistv5 – Published: 2019-03-25 18:30 – Updated: 2025-04-23 19:48
VLAI
Summary
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
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CVE-2019-3860 (GCVE-0-2019-3860)
Vulnerability from cvelistv5 – Published: 2019-03-25 18:30 – Updated: 2024-08-04 19:19
VLAI
Summary
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SFTP packets with empty payloads are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Severity
5 (Medium)
CWE
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://www.libssh2.org/CVE-2019-3860.html | x_refsource_MISC |
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| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.debian.org/security/2019/dsa-4431 | vendor-advisoryx_refsource_DEBIAN |
| https://seclists.org/bugtraq/2019/Apr/25 | mailing-listx_refsource_BUGTRAQ |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://lists.debian.org/debian-lts-announce/2019… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/technetwork/security-advis… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
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CVE-2019-3861 (GCVE-0-2019-3861)
Vulnerability from cvelistv5 – Published: 2019-03-25 18:30 – Updated: 2024-08-04 19:19
VLAI
Summary
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet length are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Severity
5 (Medium)
CWE
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://www.libssh2.org/CVE-2019-3861.html | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2… | x_refsource_CONFIRM |
| https://lists.debian.org/debian-lts-announce/2019… | mailing-listx_refsource_MLIST |
| https://security.netapp.com/advisory/ntap-2019032… | x_refsource_CONFIRM |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.debian.org/security/2019/dsa-4431 | vendor-advisoryx_refsource_DEBIAN |
| https://seclists.org/bugtraq/2019/Apr/25 | mailing-listx_refsource_BUGTRAQ |
| https://access.redhat.com/errata/RHSA-2019:2136 | vendor-advisoryx_refsource_REDHAT |
| https://www.oracle.com/technetwork/security-advis… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
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CVE-2019-3863 (GCVE-0-2019-3863)
Vulnerability from cvelistv5 – Published: 2019-03-25 17:52 – Updated: 2025-12-19 03:02
VLAI
Summary
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
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CVE-2019-3858 (GCVE-0-2019-3858)
Vulnerability from cvelistv5 – Published: 2019-03-21 20:22 – Updated: 2024-08-04 19:19
VLAI
Summary
An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Severity
5 (Medium)
CWE
Assigner
References
17 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
|
Date Public
2019-03-13 00:00
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CVE-2019-3855 (GCVE-0-2019-3855)
Vulnerability from cvelistv5 – Published: 2019-03-21 20:13 – Updated: 2025-12-17 21:40
VLAI
Summary
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
27 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
|
Date Public
2019-03-13 00:00
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CVE-2019-3862 (GCVE-0-2019-3862)
Vulnerability from cvelistv5 – Published: 2019-03-20 21:39 – Updated: 2024-08-04 19:19
VLAI
Summary
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Severity
7.3 (High)
CWE
Assigner
References
18 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
|
Date Public
2019-03-13 00:00
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CVE-2019-3859 (GCVE-0-2019-3859)
Vulnerability from cvelistv5 – Published: 2019-03-20 21:18 – Updated: 2025-12-18 11:43
VLAI
Summary
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Severity
5 (Medium)
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
20 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
|
Date Public
2019-03-13 00:00
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CVE-2016-0787 (GCVE-0-2016-0787)
Vulnerability from cvelistv5 – Published: 2016-04-13 17:00 – Updated: 2024-08-05 22:30
VLAI
Summary
The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
12 references
| URL | Tags |
|---|---|
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| https://kc.mcafee.com/corporate/index?page=conten… | x_refsource_CONFIRM |
| http://www.oracle.com/technetwork/topics/security… | x_refsource_CONFIRM |
| https://www.libssh2.org/CVE-2016-0787.patch | x_refsource_CONFIRM |
| https://www.libssh2.org/adv_20160223.html | x_refsource_CONFIRM |
| https://puppet.com/security/cve/CVE-2016-0787 | x_refsource_CONFIRM |
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/201606-12 | vendor-advisoryx_refsource_GENTOO |
| http://lists.opensuse.org/opensuse-updates/2016-0… | vendor-advisoryx_refsource_SUSE |
| https://bto.bluecoat.com/security-advisory/sa120 | x_refsource_CONFIRM |
| http://www.debian.org/security/2016/dsa-3487 | vendor-advisoryx_refsource_DEBIAN |
| http://www.securityfocus.com/bid/82514 | vdb-entryx_refsource_BID |
Date Public
2016-02-23 00:00
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CVE-2015-1782 (GCVE-0-2015-1782)
Vulnerability from cvelistv5 – Published: 2015-03-13 14:00 – Updated: 2024-08-06 04:54
VLAI
Summary
The kex_agree_methods function in libssh2 before 1.5.0 allows remote servers to cause a denial of service (crash) or have other unspecified impact via crafted length values in an SSH_MSG_KEXINIT packet.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
8 references
| URL | Tags |
|---|---|
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| http://www.mandriva.com/security/advisories?name=… | vendor-advisoryx_refsource_MANDRIVA |
| http://www.securityfocus.com/bid/73061 | vdb-entryx_refsource_BID |
| http://www.oracle.com/technetwork/topics/security… | x_refsource_CONFIRM |
| http://www.debian.org/security/2015/dsa-3182 | vendor-advisoryx_refsource_DEBIAN |
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| http://lists.fedoraproject.org/pipermail/package-… | vendor-advisoryx_refsource_FEDORA |
| http://www.libssh2.org/adv_20150311.html | x_refsource_CONFIRM |
Date Public
2015-03-11 00:00
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