{"id":"CVE-2026-55655","summary":"Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions","details":"A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is possible by pre-binding the preferred abstract X socket name when X11 forwarding is enabled and a local UNIX-domain X socket is used. A successful attack can compromise the confidentiality of forwarded X11 traffic, including sensitive window contents and input, and may allow some manipulation of the forwarded session.","modified":"2026-07-15T01:49:08.571051049Z","published":"2026-06-23T03:36:25.724Z","database_specific":{"cna_assigner":"redhat","cwe_ids":["CWE-923"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55655.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-2026-55655"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55655.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55655"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462250"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openssh/openssh-portable","events":[{"introduced":"d5dacb43fa30c2f6d7eebbd4c5fcf906c3b5d5d8"},{"last_affected":"94eb6858efecc1b4f02d8a6bd35e149f55c814c8"}],"database_specific":{"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:*:*:*:*:*:*:*"],"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"}],"source":"CPE_STRING"}}],"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-2026-55655.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N"}]}