CVE-2026-55653

Name of the Vulnerable Software and Affected Versions OpenSSH (affected versions not specified)

Description A double free flaw exists 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. A malicious SSH server can exploit this to cause client-side process termination, leading to a Denial of Service (DoS).

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.