CVE & CISA-KEV Catalog

CVE-2026-55655

MEDIUM
5.0
CVSS v3
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.

CWE-923

How to fix

Remediation Available
opensshRed Hat / RHEL
Fixed in:main@x86_64RHSA-2026:36759
Fixed in:main@aarch64RHSA-2026:36759
Fixed in:main@srcRHSA-2026:36759
opensshRocky
Fixed in:main@aarch64RHSA-2026:36759
Fixed in:main@x86_64RHSA-2026:36759
Fixed in:main@srcRHSA-2026:36759

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredLow
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityLow
AvailabilityNone

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

Exploit Intelligence

0.09%probability of exploitation in 30 days
1stpercentile

Low risk: more likely to be exploited than 1% of all known CVEs.

References

Other references1

Related Vulnerabilities

Other CWE-923 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-24974High7.59.8%-Fix
CVE-2025-48999High8.86.8%-Fix
CVE-2021-38487High8.23.3%-Fix
CVE-2019-17440Critical10.01.7%--
CVE-2022-2663Medium5.31.4%-Fix
CVE-2021-32635Medium6.31.4%--
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-08.