Is CVE-2026-74901 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74901?

CVE-2026-74901 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-74901

Description

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.