Improper Restriction of Communication Channel to Intended Endpoints Affecting openssh package, versions <0:9.9p1-25.el10_2


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-CENTOS10-OPENSSH-17405039
  • published23 Jun 2026
  • disclosed22 Jun 2026

Introduced: 22 Jun 2026

CVE-2026-55655  (opens in a new tab)
CWE-923  (opens in a new tab)

How to fix?

Upgrade Centos:10 openssh to version 0:9.9p1-25.el10_2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

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

CVSS Base Scores

version 3.1