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Vulnerabilities CVE-2026-55655

CVE-2026-55655

Medium
Open
TLP:CLEAR

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

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Description

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.

Details

CVSS Score
5.0
EPSS Score
0.09%

0.5th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
Confidence
90%
Published
Jun 23, 2026
Last Modified
Aug 12, 2026
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