CVE-2026-55654

Name: CVE-2026-55654
Creator: NVD / NIST
Published: 2026-06-23T04:17:40.587+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 0.31%

Last modified Jun 25, 2026

CVE-2026-55654 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. 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. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.7/10

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

EPSS Probability

0.31%

22.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	All versions
Redhat	Hardened Images	All versions
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0
Redhat	Enterprise Linux	10.0

References

https://access.redhat.com/security/cve/CVE-2026-55654Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2462493Exploit, Issue Tracking, Vendor Advisory

Timeline

Published: Jun 23, 2026
Last Modified: Jun 25, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-55654?

How severe is CVE-2026-55654?

CVE-2026-55654 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-55654?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-55654?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST