CVE-2026-59848: Libssh

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side 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.