{"id":"CVE-2026-55655","title":"A flaw was found in OpenSSH","summary":"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 …","severity":"medium","cvss":5,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","cwe":["CWE-923"],"vendor":"openbsd","product":"openssh","affected":["openssh","enterprise_linux = 6.0","enterprise_linux = 7.0","enterprise_linux = 8.0","enterprise_linux = 9.0","enterprise_linux = 10.0"],"published":"2026-06-23","updated":"2026-10-06","sourceUpdated":"2026-10-06T16:17:08.293","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55655","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:36759","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47755","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/errata/RHSA-2026:76748","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-55655","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462250","label":"secalert@redhat.com"}],"tags":["nvd","cve.org"],"epss":0.00124,"epssPercentile":0.01873,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-23T12:21:42.502865Z"},"ingestedAt":"2026-10-06T16:04:04.488Z","slug":"CVE-2026-55655","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `openssh`\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.","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}