---
id: CVE-2026-55654
title: A flaw was found in OpenSSH
summary: >-
  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 au…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
vendor: openbsd
product: openssh
affected:
  - openssh
  - hardened_images
  - enterprise_linux = 6.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
patched:
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - hardened_images
  - update_infrastructure 5
published: '2026-06-23'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T23:17:11.727'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55654'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:36759'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47756'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47757'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:54387'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:58981'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-55654'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2462493'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55654.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-55654'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55654'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-23T12:11:38.299870Z'
epss: 0.00652
epssPercentile: 0.49012
ingestedAt: '2026-09-23T11:22:32.915Z'
---

## Overview

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

- `openssh`
- `hardened_images`
- `enterprise_linux = 6.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:47757** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-07-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:47757)
- **RHSA-2026:47756** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47756)
- **RHSA-2026:36759** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36759)
- **RHSA-2026:54387** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-08-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:54387)
- **RHSA-2026:58981** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58981)
- **Red Hat VEX** · Low · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55654.json)