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CVE-2026-55655Disclosure(openbsd / enterprise_linux)

LOWCVSS 6.1 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

openbsd CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-923

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • enterprise_linux
  • openssh

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Affected systems

Vendors
openbsdredhat
Products
enterprise_linuxopenssh

6 versions affected across 2 products

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-06-23: 2Technical Details · 2026-06-23: 206-23
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* 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 pre-binding t… https://www.cve.org/CVERecord?id=CVE-2026-55655 ----- Traducción: CVE-2026-55655 Se … http://infoflow.cloud`

    Post summary

    A flaw in OpenSSH allows local unprivileged attackers on Linux clients to hijack X11 forwarding connections via pre‑binding. The post is an initial disclosure with no exploit, patch, or evidence of active exploitation.

    0000039
    88 followersView on X
  • CVE@CVEnew
    Disclosure

    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 pre-binding t… https://www.cve.org/CVERecord?id=CVE-2026-55655

    Post summary

    The statement discloses CVE-2026-55655, a local privilege‑exploitation flaw in OpenSSH that lets an unprivileged Linux client hijack X11 forwarding connections.

    00000903
    57.7K followersView on X
CPE platform detail6 entries

6 of 6 entries

PartVendorProductVersionTarget SWTarget HW
Appopenbsdopenssh---
OSredhatenterprise_linux10.0--
OSredhatenterprise_linux6.0--
OSredhatenterprise_linux7.0--
OSredhatenterprise_linux8.0--
OSredhatenterprise_linux9.0--

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