CVE-2026-74901 [CRITICAL] – openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in pq

openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in pqc.py where AES-GCM decryption failures trigger fallback to unauthenticated AES-CTR mode. Attackers can modify ciphertext in transit to bypass integrity verification and perform bit-flipping attacks without detection.