Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions

{
  "id": "0af0ef47e43e9936a5e540780e901c2531686529fecf2bc3c0b27474577115b9",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-55655",
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  "payload": {
    "kind": "advisory",
    "title": "Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions",
    "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 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.",
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      "modified": "2026-10-26T03:28:24.360Z",
      "provider": "cve",
      "references": [
        "https://access.redhat.com/errata/RHSA-2026:36759",
        "https://access.redhat.com/errata/RHSA-2026:47755",
        "https://access.redhat.com/errata/RHSA-2026:47756",
        "https://access.redhat.com/errata/RHSA-2026:47757",
        "https://access.redhat.com/errata/RHSA-2026:54387",
        "https://access.redhat.com/errata/RHSA-2026:58981",
        "https://access.redhat.com/errata/RHSA-2026:76748",
        "https://access.redhat.com/errata/RHSA-2026:76993",
        "https://access.redhat.com/errata/RHSA-2026:80513",
        "https://access.redhat.com/errata/RHSA-2026:82749",
        "https://access.redhat.com/errata/RHSA-2026:82750",
        "https://access.redhat.com/errata/RHSA-2026:82751",
        "https://access.redhat.com/errata/RHSA-2026:82752",
        "https://access.redhat.com/errata/RHSA-2026:82753",
        "https://access.redhat.com/errata/RHSA-2026:82754",
        "https://access.redhat.com/errata/RHSA-2026:82755",
        "https://access.redhat.com/errata/RHSA-2026:82756",
        "https://access.redhat.com/errata/RHSA-2026:82757",
        "https://access.redhat.com/errata/RHSA-2026:82758",
        "https://access.redhat.com/errata/RHSA-2026:82759",
        "https://access.redhat.com/errata/RHSA-2026:82761",
        "https://access.redhat.com/errata/RHSA-2026:82762",
        "https://access.redhat.com/errata/RHSA-2026:82763",
        "https://access.redhat.com/errata/RHSA-2026:82897",
        "https://access.redhat.com/errata/RHSA-2026:82898",
        "https://access.redhat.com/errata/RHSA-2026:82899",
        "https://access.redhat.com/errata/RHSA-2026:82900",
        "https://access.redhat.com/errata/RHSA-2026:82901",
        "https://access.redhat.com/errata/RHSA-2026:82902",
        "https://access.redhat.com/errata/RHSA-2026:82903",
        "https://access.redhat.com/errata/RHSA-2026:82904",
        "https://access.redhat.com/errata/RHSA-2026:82907",
        "https://access.redhat.com/errata/RHSA-2026:82908",
        "https://access.redhat.com/errata/RHSA-2026:82909",
        "https://access.redhat.com/errata/RHSA-2026:82910",
        "https://access.redhat.com/errata/RHSA-2026:82912",
        "https://access.redhat.com/errata/RHSA-2026:82913",
        "https://access.redhat.com/errata/RHSA-2026:82914",
        "https://access.redhat.com/errata/RHSA-2026:82915",
        "https://access.redhat.com/errata/RHSA-2026:82916",
        "https://access.redhat.com/errata/RHSA-2026:82917",
        "https://access.redhat.com/errata/RHSA-2026:82918",
        "https://access.redhat.com/errata/RHSA-2026:82920",
        "https://access.redhat.com/errata/RHSA-2026:82921",
        "https://access.redhat.com/errata/RHSA-2026:82922",
        "https://access.redhat.com/errata/RHSA-2026:82923",
        "https://access.redhat.com/errata/RHSA-2026:89739",
        "https://access.redhat.com/security/cve/CVE-2026-55655",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2462250"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-55655",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
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                    "version": "2.0.3",
                    "timestamp": "2026-06-23T12:21:42.502865Z"
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            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
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          "shortName": "redhat",
          "dateUpdated": "2026-10-26T03:28:24.360Z"
        }
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    },
    "related_cves": [
      {
        "value": "CVE-2026-55655",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 239491,
  "published_at": "2026-06-23T03:36:25.724+00:00"
}