FFC-DH Peer Validation Uses Attacker-Supplied q

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CVE-2026-42770 FFC-DH Peer Validation Uses Attacker-Supplied q

Issue summary: When EVPPKEYderivesetpeer is called with a DHX X9.42 peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r a small prime factor of the cofacto...

CVE-2026-42770

The OpenSSL library is vulnerable to a small-subgroup-confinement attack (Lim–Lee) due to insufficient subgroup membership checks when EVP_PKEY_derive_set_peer() is used with DHX (X9.42) peer keys. The software fails to validate that the peer's q parameter matches the local key's q parameter, all...

CVE-2026-42770 FFC-DH Peer Validation Uses Attacker-Supplied q

Issue summary: When EVPPKEYderivesetpeer is called with a DHX X9.42 peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r a small prime factor of the cofacto...

CVE-2026-42770 FFC-DH Peer Validation Uses Attacker-Supplied q

Issue summary: When EVPPKEYderivesetpeer is called with a DHX X9.42 peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r a small prime factor of the cofacto...

UBUNTU-CVE-2026-42770

Issue summary: When EVPPKEYderivesetpeer is called with a DHX X9.42 peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r a small prime factor of the cofacto...