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 possible by…

PriorityP429medium6.1CVSS 3.1

AVLACLPRNUIRSUCHILAN

EPSS

0.12%

2.1th percentile

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.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
redhat	enterprise_linux	—	—
redhat	enterprise_linux	—	—
redhat	enterprise_linux	—	—
redhat	enterprise_linux	—	—
redhat	enterprise_linux	—	—

CVSS provenance

nvdv3.16.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

vendor_redhat5.0MEDIUM

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