CVE-2026-55655 (GCVE-0-2026-55655)
Vulnerability from cvelistv5
Published
2026-06-23 03:36
Modified
2026-08-25 09:41
Severity ?
5.0 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
CWE
  • CWE-923 - Improper Restriction of Communication Channel to Intended Endpoints
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.
References
https://access.redhat.com/errata/RHSA-2026:36759 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47755 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47756 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47757 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:54387 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:58981 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-55655 vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2462250 issue-tracking, x_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:9.9p1-25.el10_2   < *
    cpe:/o:redhat:enterprise_linux:10.2
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-30.el8_10   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-30.el8_10   < *
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:9.9p1-9.el9_8   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:9.9p1-9.el9_8   < *
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
   Red Hat Red Hat Hardened Images Unaffected: 10.3p1-6.hum1   < *
    cpe:/a:redhat:hummingbird:1
 Create a notification for this product.
   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1786435483   < *
    cpe:/a:redhat:rhui:5::el9
 Create a notification for this product.
   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1786533529   < *
    cpe:/a:redhat:rhui:5::el9
 Create a notification for this product.
   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1787135742   < *
    cpe:/a:redhat:rhui:5::el9
 Create a notification for this product.
   Red Hat Red Hat Update Infrastructure 5 Unaffected: 1787241260   < *
    cpe:/a:redhat:rhui:5::el9
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
   Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
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\"RHSA-2026:47755\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47756\", \"name\": \"RHSA-2026:47756\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47757\", \"name\": \"RHSA-2026:47757\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:54387\", \"name\": \"RHSA-2026:54387\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:58981\", \"name\": \"RHSA-2026:58981\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-55655\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2462250\", \"name\": \"RHBZ#2462250\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"To mitigate this issue, disable X11 forwarding on OpenSSH clients when it is not required. This can be achieved by avoiding the use of `-X` or `-Y` options when invoking `ssh`, or by setting `ForwardX11 no` in the SSH client configuration file (`~/.ssh/config` or `/etc/ssh/ssh_config`). Disabling X11 forwarding will prevent the client from attempting to establish X11 connections, thereby removing the attack vector.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-923\", \"description\": \"Improper Restriction of Communication Channel to Intended Endpoints\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-08-25T09:41:09.843Z\"}, \"x_redhatCweChain\": \"CWE-923: Improper Restriction of Communication Channel to Intended Endpoints\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-55655\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-25T09:41:09.843Z\", \"dateReserved\": \"2026-06-16T23:55:05.737Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-06-23T03:36:25.724Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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