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medium4.3

CVE-2026-55653

A flaw was found in OpenSSH.

Impact

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

VendorProductAffected versions
OpenbsdOpenssh
All versions
RedhatHardened Images
All versions
RedhatOpenshift Container Platform
Version 4.0
RedhatEnterprise Linux
Versions 6.0, 7.0, 8.0, 9.0, 10.0

Weakness classification

CWE-415

References