CVE-2026-55654: OpenBSD OpenSSH

Low severity, CVSS 3.7. EPSS: 0.7% chance of exploitation in the next 30 days.

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.

Affected products

• OpenBSD OpenSSH: affected versions not specified
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Hardened Images: affected versions not specified

Published 2026-06-23. Last modified 2026-09-24.