cvedb.io
CVE-2026-55653
MEDIUM · CVSS 4.3
EPSS exploitation probability: 0%
Published 2026-06-23T04:17:36.600 · Last modified 2026-06-25T16:57:41.960

Summary

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

openbsd — openssh

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.