{"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":0.51038,"ingestedAt":"2026-09-23T11:22:32.915Z","slug":"CVE-2026-55654","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `openssh`\n- `hardened_images`\n- `enterprise_linux = 6.0`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n- `enterprise_linux = 10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **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)\n- **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)\n- **RHSA-2026:36759** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36759)\n- **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)\n- **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)\n- **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)","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}