> CVE-2026-55653 [MEDIUM]

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PUBLISHED
2026-06-23 04:17
MODIFIED
2026-06-23 04:17
CVSS_SCORE V3
4.3
EPSS (Prob. Exploit)
0.43%
Top 64.0%
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 malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).

> 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:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
EXPLOITABILITY
2.8
IMPACT
1.4

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
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
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-415

> CWE DETAILED DESCRIPTIONS

CWE-415: Double Free - The product calls free() twice on the same memory address.

> 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: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service

AFFECTED PACKAGES:
Unknown / Unknown
5 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-415: Double Free - The product calls free() twice on the same memory address.
📊 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-2026-55653
https://bugzilla.redhat.com/show_bug.cgi?id=2462351
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