VULNERABILITY INTELLIGENCE
CVE-2026-55653
CVSS score4.3 MEDIUM
EPSS probability0.53%
CISA KEVNot currently listed
Published2026-06-23
Last modified2026-10-30
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
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).
Weakness classification
- secalert@redhat.com: CWE-415