CVE-2026-0967: Libssh

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.

Affected products

• Libssh Libssh: up to and including 0.11.3
• Red Hat Enterprise Linux: version 9.0 only; version 10.0 only

Published 2026-03-26. Last modified 2026-09-01.