CVE WatchAug 25, 2026

CVE-2026-55655

A flaw was found in OpenSSH. A local unprivileged attacker on a Linux client host can hijack client-side X11 forwarding connections. This is

CVSS

5.0

Medium

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jun 23, 2026 · Last modified: Aug 25, 2026 · CWE-923

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-08-022026-08-30

Technical 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.

Official references

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