6.5

CVE-2026-55653

Exploit

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

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).
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Openbsd ≫ Openssh Version -
Redhat ≫ Hardened Images Version -
Redhat ≫ Enterprise Linux Version 6.0
Redhat ≫ Enterprise Linux Version 7.0
Redhat ≫ Enterprise Linux Version 8.0
Redhat ≫ Enterprise Linux Version 9.0
Redhat ≫ Enterprise Linux Version 10.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.213
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 6.5 2.8 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
RedHat 4.3 2.8 1.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CWE-415 Double Free

The product calls free() twice on the same memory address.

https://bugzilla.redhat.com/show_bug.cgi?id=2462351
Vendor Advisory
Exploit
Issue Tracking
https://access.redhat.com/errata/RHSA-2026:36759
https://access.redhat.com/security/cve/CVE-2026-55653
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:47755
https://access.redhat.com/errata/RHSA-2026:47756
https://access.redhat.com/errata/RHSA-2026:47757
https://access.redhat.com/errata/RHSA-2026:54387
https://access.redhat.com/errata/RHSA-2026:58981
https://access.redhat.com/errata/RHSA-2026:76748
https://access.redhat.com/errata/RHSA-2026:76993