> CVE-2026-55655 [MEDIUM]

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PUBLISHED
2026-06-23 04:17
MODIFIED
2026-06-23 04:17
CVSS_SCORE V3
5.0
EPSS (Prob. Exploit)
0.10%
Top 99.4%
DATA SOURCES:
NVD 🔗 2026-06-23 RED HAT 🔗 2026-06-28 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 OSV 🔗 2026-07-26 MSRC 🔗 2026-11-02

> 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

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
EXPLOITABILITY
0.8
IMPACT
4.2

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Local (L)
Exploit nécessite un accès local au système
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
Required (R)
Nécessite une action utilisateur (clic lien, ouverture fichier, etc.)
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-923

> CWE DETAILED DESCRIPTIONS

CWE-923: Improper Restriction of Communication Channel to Intended Endpoints - The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (C...
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System...
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (...
Red Hat Security Advisory: Red Hat Update Infrastructure 5.2 security update
The latest release of Red Hat Update Infrastructure. For more details, see the product documentation.
Red Hat Security Advisory: Red Hat Update Infrastructure 5.3 Technology Preview security update
A new set of Red Hat Update Infrastructure container images is now available as a Technology Preview in the Red Hat container registry.
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vul...
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A C...
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vuln...
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (Neuron)
Red Hat AI Base Images 3.4.5 (Neuron) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.5 (ROCm 7.0)
Red Hat AI Base Images 3.2.5 (ROCm 7.0) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.5 (ROCm 6.4)
Red Hat AI Base Images 3.2.5 (ROCm 6.4) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.5 (CUDA 12.9)
Red Hat AI Base Images 3.2.5 (CUDA 12.9) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.5 (TPU)
Red Hat AI Base Images 3.2.5 (TPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (CUDA 12.9)
Red Hat AI Base Images 3.5.4 (CUDA 12.9) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (Spyre)
Red Hat AI Base Images 3.3.6 (Spyre) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (CUDA 13.0)
Red Hat AI Base Images 3.5.4 (CUDA 13.0) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (Rubin)
Red Hat AI Base Images 3.5.4 (Rubin) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.6 (ROCm)
Red Hat AI Base Images 3.0.6 (ROCm) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (CUDA 13.0)
Red Hat AI Base Images 3.3.6 (CUDA 13.0) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (TPU)
Red Hat AI Base Images 3.5.4 (TPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (ROCm 7.14)
Red Hat AI Base Images 3.5.4 (ROCm 7.14) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (Neuron)
Red Hat AI Base Images 3.5.4 (Neuron) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (CPU)
Red Hat AI Base Images 3.5.4 (CPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (Neuron)
Red Hat AI Base Images 3.3.6 (Neuron) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.6 (TPU)
Red Hat AI Base Images 3.0.6 (TPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.6 (Spyre)
Red Hat AI Base Images 3.0.6 (Spyre) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (CPU)
Red Hat AI Base Images 3.3.6 (CPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (CUDA 13.0)
Red Hat AI Base Images 3.4.5 (CUDA 13.0) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (TPU)
Red Hat AI Base Images 3.4.5 (TPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (Gaudi)
Red Hat AI Base Images 3.4.5 (Gaudi) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (ROCm 7.1)
Red Hat AI Base Images 3.4.5 (ROCm 7.1) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (Spyre)
Red Hat AI Base Images 3.4.5 (Spyre) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (Gaudi)
Red Hat AI Base Images 3.5.4 (Gaudi) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (ROCm 7.0)
Red Hat AI Base Images 3.3.6 (ROCm 7.0) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.6 (CPU)
Red Hat AI Base Images 3.0.6 (CPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.5 (CPU)
Red Hat AI Base Images 3.2.5 (CPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (CUDA 12.9)
Red Hat AI Base Images 3.3.6 (CUDA 12.9) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.5.4 (Spyre)
Red Hat AI Base Images 3.5.4 (Spyre) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (ROCm 6.4)
Red Hat AI Base Images 3.4.5 (ROCm 6.4) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (ROCm 6.4)
Red Hat AI Base Images 3.3.6 (ROCm 6.4) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.3.6 (TPU)
Red Hat AI Base Images 3.3.6 (TPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (CPU)
Red Hat AI Base Images 3.4.5 (CPU) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.4.5 (CUDA 12.9)
Red Hat AI Base Images 3.4.5 (CUDA 12.9) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.0.6 (CUDA)
Red Hat AI Base Images 3.0.6 (CUDA) is now available.
Red Hat Security Advisory: Red Hat AI Base Images 3.2.5 (Spyre)
Red Hat AI Base Images 3.2.5 (Spyre) is now available.
Red Hat Security Advisory: openssh security update
An update for openssh is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A C...
Red Hat Security Advisory: Red Hat AI Base Images 3.0.7 (CPU)
Red Hat AI Base Images 3.0.7 (CPU) is now available.

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Moderate

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

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

AFFECTED PACKAGES:
Unknown / Unknown
31 versions affected

> HISTORIQUE DES MODIFICATIONS

Première apparition
23/06/2026 04:17
Source: NVD
📊 ENRICHISSEMENT 01/07/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-923: Improper Restriction of Communication Channel to Intended Endpoints - The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it d...
📊 ENRICHISSEMENT 28/06/2026 05:02
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 23:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 22:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 21:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 20:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 19:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 18:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 17:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 16:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 15:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 14:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 13:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": "Moderate" }
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 12:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Moderate", "severity_scale": null }
📊 ENRICHISSEMENT 23/06/2026 12:30
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 15 Dernière mise à jour: 4 months ago

> REFERENCES

https://access.redhat.com/security/cve/CVE-2026-55655
https://bugzilla.redhat.com/show_bug.cgi?id=2462250
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