Use After Free Affecting libssh-debugsource package, versions <0:0.10.6-1.amzn2023.0.2


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.19% (9th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-AMZN2023-LIBSSHDEBUGSOURCE-12561651
  • published9 Sept 2025
  • disclosed22 Jul 2025

Introduced: 22 Jul 2025

CVE-2025-4878  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 libssh-debugsource to version 0:0.10.6-1.amzn2023.0.2 or higher.
This issue was patched in ALAS2023-2025-1155.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh-debugsource package and not the libssh-debugsource package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption.

CVSS Base Scores

version 3.1