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


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-RHEL10-OPENSSHDEBUGINFO-18472977
  • published31 Jul 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 RHEL:10 openssh-debuginfo to version 0:9.9p1-25.el10_2 or higher.
This issue was patched in RHSA-2026:47757.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-debuginfo package and not the openssh-debuginfo package as distributed by RHEL. See How to fix? for RHEL: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