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5.0
CVE-2026-55655
red hat · red hat enterprise linux

Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions

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.

Affected Products

VendorProductVersions
red hatred hat enterprise linux—

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
open sourceopensshcert_advisory90%

References

  • https://access.redhat.com/security/cve/CVE-2026-55655(vdb-entry, x_refsource_REDHAT)
  • https://bugzilla.redhat.com/show_bug.cgi?id=2462250(issue-tracking, x_refsource_REDHAT)

Related News (3 articles)

Tier A
Microsoft MSRC7h ago
CVE-2026-55655 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterprise linux openssh client versions
→ No new info (linked only)
Tier B
BSI Advisories5d ago
[NEU] [mittel] OpenSSH: Mehrere Schwachstellen
→ No new info (linked only)
Tier C
VulDB5d ago
CVE-2026-55655 | OpenSSH communication channel to intended endpoints
→ No new info (linked only)
CVSS 3.15.0 NONE
CISA KEV❌ No
Actively exploited❌ No
CWECWE-923
PublishedJun 23, 2026
Last enriched5d ago
Trending Score35
Source articles3
Independent3
Info Completeness0/14
Missing: cve_id, title, description, vendor, product, versions, cvss, epss, cwe, kev, exploit, patch, iocs, mitre_attack

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Jun 23, 2026
Discovered by ZDM
Jun 23, 2026