CVE-2026-55655: Improper Restriction of Communication Channel to Intended Endpoints in Red Hat Red Hat Enterprise Linux 10
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.
CVE-2026-55655: Improper Restriction of Communication Channel to Intended Endpoints in Red Hat Red Hat Enterprise Linux 10
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.
CVSS v3.1
Score 5.0medium
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-16T23:55:05.737Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-55655","vendor":"Red Hat"}]
Threat ID: 6a3a0366eed863c81e190b89
Added to database: 06/23/2026, 03:54:14 UTC
Last updated: 06/23/2026, 03:54:14 UTC
Views: 1
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