{"id":"CVE-2026-55654","summary":"Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination","details":"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.","modified":"2026-07-10T03:54:36.975192669Z","published":"2026-06-23T03:37:00.160Z","database_specific":{"cna_assigner":"redhat","cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55654.json"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://catalog.redhat.com/software/containers/"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36759"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-55654"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55654.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55654"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462493"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openssh/openssh-portable","events":[{"introduced":"d5dacb43fa30c2f6d7eebbd4c5fcf906c3b5d5d8"},{"last_affected":"94eb6858efecc1b4f02d8a6bd35e149f55c814c8"}],"database_specific":{"source":"CPE_STRING","extracted_events":[{"introduced":"6.0"},{"last_affected":"6.0"},{"introduced":"7.0"},{"last_affected":"7.0"},{"introduced":"8.0"},{"last_affected":"8.0"},{"introduced":"9.0"},{"last_affected":"9.0"}],"cpe":["cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*","cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*","cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*","cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*"]}}],"versions":["6.0","7.0","8.0","9.0","V_9_0_P1","V_8_9_P1","V_8_8_P1","V_8_7_P1","V_8_6_P1","V_8_5_P1","V_8_4_P1","V_8_2_P1","V_8_1_P1","V_8_0_P1","V_7_9_P1","V_7_8_P1","V_7_7_P1","V_7_6_P1","V_7_5_P1","V_7_4_P1","V_7_3_P1","V_7_2_P1","V_7_1_P1","V_7_0_P1","V_6_9_P1","V_6_8_P1","V_6_6_P1","V_6_5_P1","V_6_2_P1","V_6_1_P1","V_6_0_P1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55654.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}