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ALSA-2026:18683 — Moderate: libssh security update

Affected: AlmaLinux:9: libssh, AlmaLinux:9: libssh-config, AlmaLinux:9: libssh-devel

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

* libssh: Double Free Vulnerability in libssh Key Export Functions (CVE-2025-5351) * libssh: Use of uninitialized variable in privatekey_from_file() (CVE-2025-4878) * libssh: Write beyond bounds in binary to base64 conversion functions (CVE-2025-4877) * libssh: NULL Pointer Dereference in libssh KEX Session ID Calculation (CVE-2025-8114) * libssh: Memory Exhaustion via Repeated Key Exchange in libssh (CVE-2025-8277) * libssh: Buffer underflow in ssh_get_hexa() on invalid input (CVE-2026-0966) * libssh: Improper sanitation of paths received from SCP servers (CVE-2026-0964) * libssh: libssh: Denial of Service via improper configuration file handling (CVE-2026-0965) * libssh: libssh: Denial of Service via inefficient regular expression processing (CVE-2026-0967) * libssh: libssh: Denial of Service due to malformed SFTP message (CVE-2026-0968)

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.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinuxRelease Notes linked from the References section.

bdu:2025-07641

BELL-CVE-2025-4877

Affected: Alpaquita:23: libssh, Alpaquita:25: libssh, Alpaquita:stream: libssh

certfr-2025-avi-0622 — De multiples vulnérabilités ont été découvertes dans les produits VMware. Certaines d'entre elles permettent à un attaq…

certfr-2025-avi-0622

EUVD-2026-361736

fkie_cve-2025-4877

There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.

GHSA-pwrf-jm93-99r3

msrc_CVE-2025-4877 — Libssh: write beyond bounds in binary to base64 conversion functions

msrc_CVE-2025-4877

OESA-2025-2127 — libssh security update

Affected: openEuler:24.03-LTS-SP2: libssh

The ssh library was designed to be used by programmers needing a working SSH implementation by the mean of a library. The complete control of the client is made by the programmer. With libssh, you can remotely execute programs, transfer files, use a secure and transparent tunnel for your remote programs. With its Secure FTP implementation, you can play with remote files easily, without third-party programs others than libcrypto (from openssl). Security Fix(es):

A vulnerability classified as critical was found in libssh up to 0.11.1.The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.As an impact it is known to affect confidentiality, integrity, and availability.Upgrading to version 0.11.2 eliminates this vulnerability.(CVE-2025-4877)

A vulnerability, which was classified as problematic, has been found in libssh up to 0.11.1.Using CWE to declare the problem leads to CWE-824. The product accesses or uses a pointer that has not been initialized.Impacted is confidentiality, integrity, and availability.Upgrading to version 0.11.2 eliminates this vulnerability.(CVE-2025-4878)

A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leadin…

openSUSE-SU-2025:15243-1 — libssh-config-0.11.2-1.1 on GA media

libssh-config-0.11.2-1.1 on GA media

SUSE-SU-2025:02279-1 — Security update for libssh

Security update for libssh

UBUNTU-CVE-2025-4877

Affected: Ubuntu:Pro:16.04:LTS: libssh, Ubuntu:Pro:18.04:LTS: libssh, Ubuntu:Pro:20.04:LTS: libssh, Ubuntu:22.04:LTS: libssh, Ubuntu:24.04:LTS: libssh

WID-SEC-W-2025-1423 — libssh: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in libssh ausnutzen, um einen Denial of Service Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, und potentiell weitere nicht spezifizierte Auswirkungen zu verursachen.