Public vulnerability disclosure
CVE-2026-55655
Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
publishedCWE-923
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.
Technical severity5.0 mediumCVSS 3.1 · CNA: redhat
Published2026-06-23Source updated 2026-11-05
Collected2026-11-052 attributed sources
Fixes and workarounds
Workaround
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.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Red Hat Enterprise Linux 10 Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:9.9p1-25.el10_2; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:9.9p1-7.el10_0.5; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.0p1-30.el8_10; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:9.9p1-9.el9_8; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.7p1-30.el9_2.13; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.7p1-38.el9_4.10; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.7p1-45.el9_6.5; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Hardened Images Red Hat openssh-main
https://catalog.redhat.com/software/containers/ |
≥ 10.3p1-6.hum1; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.0 Red Hat rhai/base-image-cuda-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818590; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.0 Red Hat rhai/base-image-cpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818589; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.0 Red Hat rhai/base-image-spyre-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818505; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.0 Red Hat rhai/base-image-tpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818496; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.0 Red Hat rhai/base-image-rocm-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818502; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.0 Red Hat rhai/base-image-cpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1793042072; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.2 Red Hat rhai/base-image-spyre-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818602; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.2 Red Hat rhai/base-image-cpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818598; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.2 Red Hat rhai/base-image-tpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818512; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.2 Red Hat rhai/base-image-cuda-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818587; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.2 Red Hat rhai/base-image-rocm-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818778; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.2 Red Hat rhai/base-image-rocm-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818512; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-tpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818782; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-rocm-6.4-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818782; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-cuda-12.9-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818627; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-rocm-7.0-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818790; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-cpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818874; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-neuron-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818792; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-cuda-13.0-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818662; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.3 Red Hat rhai/base-image-spyre-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818877; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-neuron-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791883722; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-cuda-12.9-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791881612; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-cpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791885618; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-rocm-6.4-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791881487; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-spyre-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791881732; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-rocm-7.1-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791883315; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-gaudi-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791881486; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-tpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791881769; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.4 Red Hat rhai/base-image-cuda-13.0-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791885505; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-spyre-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791819252; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-gaudi-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818749; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-cpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791819206; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-neuron-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818979; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-rocm-7.14-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791819123; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-tpu-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791818901; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-rubin-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791820333; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-cuda-13.0-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791819495; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift AI 3.5 Red Hat rhai/base-image-cuda-12.9-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1791819104; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Update Infrastructure 5 Red Hat rhui5/installer-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786435483; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Update Infrastructure 5 Red Hat rhui5/rhua-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786533529; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Update Infrastructure 5 Red Hat rhui5/installer-tp-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1787135742; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Update Infrastructure 5 Red Hat rhui5/rhua-tp-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1787241260; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 6 Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Red Hat openssh
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift/ose-rhel-coreos-8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift/ose-rhel-coreos-9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat OpenShift Container Platform 5 Red Hat openshift/ose-rhel-coreos-9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.0 medium |
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N | CNA: redhat |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2026:36759CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:47755CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:47756CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:47757CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54387CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:58981CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76748CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76993CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:80513CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82749CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82750CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82751CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82752CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82753CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82754CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82755CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82756CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82757CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82758CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82759CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82761CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82762CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82763CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82897CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82898CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82899CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82900CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82901CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82902CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82903CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82904CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82907CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82908CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82909CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82910CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82912CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82913CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82914CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82915CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82916CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82917CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82918CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82920CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82921CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82922CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:82923CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:89739CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:91232CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-55655CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2462250CNA: redhat · issue-tracking, x_refsource_REDHAT
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