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Vulnerability record · CVE-2026-55654 · published 23 June 2026

CVE-2026-55654: Openbsd openssh out-of-bounds read vulnerability

Openbsd · Openssh

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.

3.7 CVSS 3.1 Low EPSS 0.65% · top 50.8% CWE-125 · Out-of-bounds read
3.7CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
7References, 1 tagged exploit
24 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-55654), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.