CVE-2026-59845: Libssh

Medium severity, CVSS 5.9. EPSS: 0.1% chance of exploitation in the next 30 days.

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

Affected products

• Libssh Libssh: affected versions not specified
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Hardened Images: affected versions not specified

Published 2026-07-21. Last modified 2026-09-01.