CVE-2026-55655 - Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux
Posted: Tue Jun 23, 2026 5:05 am
CVE ID: CVE-2026-55655
Published: June 23, 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.
Severity: 5.0 | MEDIUM
More Information:
https://cvefeed.io/vuln/detail/CVE-2026-55655
Published: June 23, 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.
Severity: 5.0 | MEDIUM
More Information:
https://cvefeed.io/vuln/detail/CVE-2026-55655