Double Free Affecting openssh package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.2% (11th percentile)

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  • Snyk IDSNYK-RHEL6-OPENSSH-17430385
  • published23 Jun 2026
  • disclosed22 Jun 2026

Introduced: 22 Jun 2026

NewCVE-2026-55653  (opens in a new tab)
CWE-415  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:6 openssh.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by RHEL. See How to fix? for RHEL:6 relevant fixed versions and status.

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).

CVSS Base Scores

version 3.1