CVE-2025-5449: Libssh

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.

Affected products

• Libssh Libssh: version 0.11.0 only; version 0.11.1 only

Published 2025-07-25. Last modified 2026-08-31.