{"id":"CVE-2026-55653","summary":"Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service","details":"A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).","modified":"2026-07-10T03:53:36.502798867Z","published":"2026-06-23T03:36:22.741Z","database_specific":{"cna_assigner":"redhat","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55653.json","cwe_ids":["CWE-415"]},"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-2026-55653"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55653.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55653"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462351"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openssh/openssh-portable","events":[{"introduced":"485bab886137bbf8b7ec8df82bd66dc6e5654371"},{"last_affected":"94eb6858efecc1b4f02d8a6bd35e149f55c814c8"}],"database_specific":{"extracted_events":[{"introduced":"4.0"},{"last_affected":"4.0"},{"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:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*","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:*:*:*:*:*:*:*"],"source":"CPE_STRING"}}],"versions":["4.0","6.0","7.0","8.0","9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55653.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}]}