CVE-2026-55655

MediumCVSS 6.1/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Weakness enumeration

CWE-923

Affected software

No affected versions have been published.

Timeline

Published: Jun 23, 2026
Last modified: Oct 14, 2026
NVD status: Modified

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