CVE-2026-55653

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...

openssh security update

7.4p1-23.0.3fips - Change Epoch from 1 to 10 - Enable fips KDF POST Orabug: 32461750 - Disable diffie-hellman-group-exchange-sha256 KEX FIPS method Orabug: 32461739 7.4p1-23.0.3 - add KEXINITIAL flag Orabug: 36160445 - implement 'strict key exchange' CVE-2023-48795Orabug: 36160445...

Linux: BSI TR-02102-4 3.3 Key Exchange Methods

When establishing the SSH connection, keys are exchanged in order to create and exchange shared session keys for authentication and encryption. The following key exchange methods are recommended: diffie-hellman-group-exchange-sha256, diffie-hellman-group15-sha512, diffie-hellman-group16-sha512,...