Fiche vulnérabilité
CVE-2026-55653 : faille moyenne openbsd openssh (CVSS 6.5)
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).
En bref
- Sévérité
- Moyenne (CVSS 6.5)
- Vecteur CVSS
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Exploitation active
- Non signalée par la CISA
- Publication
- 23 juin 2026
- Dernière mise à jour
- 1 sept. 2026
Produits concernés
- openbsd openssh
- redhat hardened images
- redhat openshift container platform
- redhat enterprise linux
Références
- Fiche CVE-2026-55653 sur le NVD (NIST)
- access.redhat.com/errata/RHSA-2026:36759
- access.redhat.com/errata/RHSA-2026:47755
- access.redhat.com/errata/RHSA-2026:47756
- access.redhat.com/errata/RHSA-2026:47757
- access.redhat.com/errata/RHSA-2026:54387
- access.redhat.com/errata/RHSA-2026:58981
- access.redhat.com/security/cve/CVE-2026-55653
- bugzilla.redhat.com/show_bug.cgi