CVE-2026-55654

Description

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.

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Produits concernés

• Red Hat Enterprise Linux 10
• Red Hat Enterprise Linux 9
• Red Hat Hardened Images
• Red Hat Update Infrastructure 5
• Red Hat Enterprise Linux 6
• Red Hat Enterprise Linux 7
• Red Hat Enterprise Linux 8
• Red Hat OpenShift Container Platform 4
• Openbsd openssh
• Redhat hardened images
• Redhat enterprise linux

Scores CVSS

Faiblesses (CWE)

• CWE-125

Références

• https://access.redhat.com/errata/RHSA-2026:36759
• https://access.redhat.com/errata/RHSA-2026:47756
• https://access.redhat.com/errata/RHSA-2026:47757
• https://access.redhat.com/errata/RHSA-2026:54387
• https://access.redhat.com/errata/RHSA-2026:58981
• https://access.redhat.com/security/cve/CVE-2026-55654 Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2462493 ExploitIssue TrackingVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories