Return of Wrong Status Code Affecting libssh package, versions <0:0.10.4-17.el9_7


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
1.73% (77th percentile)

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  • Snyk IDSNYK-ALMALINUX9-LIBSSH-14551937
  • published23 Dec 2025
  • disclosed17 Dec 2025

Introduced: 17 Dec 2025

CVE-2025-5987  (opens in a new tab)
CWE-393  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 libssh to version 0:0.10.4-17.el9_7 or higher.
This issue was patched in ALSA-2025:23483.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh package and not the libssh package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.

CVSS Base Scores

version 3.1