CVE-2026-74901

jahlives openssl_encrypt

Published 17 Aug 2026 · updated 1 Sept 2026 · Analyzed

9.3 Critical · CVSS 4.0, vulncheck.com

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.

References

github.com/jahlives/openssl_encrypt/security/advisories/GHSA-w4j7-wfgw-r52w · Mitigation, Vendor Advisory
www.vulncheck.com/advisories/openssl-encrypt-before-authentication-bypass-via-aes-ctr-fallback · Third Party Advisory