CVE-2026-55655
Full vulnerability record from the local CVENow database.
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
MEDIUM
CVSS score
6.1
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-06-23 04:17:40.787000
Last modified
2026-10-30 08:16:57.940000
View original CVE JSON
{
"id": "CVE-2026-55655",
"sourceIdentifier": "[email protected]",
"published": "2026-06-23T04:17:40.787",
"lastModified": "2026-10-30T08:16:57.940",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
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{
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