Vulnerabilities CVE-2026-55653

CVE-2026-55653

Medium

Open

TLP:CLEAR

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

NVD CVE.org

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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).

Details

CVSS Score: 4.3
EPSS Score ⓘ: 0.28%

20.6th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Confidence: 90%
Published: Jun 23, 2026
Last Modified: Aug 12, 2026

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