CVE-2026-74901

PYSEC-2026-3773 · CVE-2026-74901 · GHSA-w4j7-wfgw-r52w

Published Aug 17, 2026 · Modified Sep 2, 2026

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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

ADVISORY https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-w4j7-wfgw-r52w
ADVISORY https://www.vulncheck.com/advisories/openssl-encrypt-before-authentication-bypass-via-aes-ctr-fallback

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CVE-2026-74901

Description

References

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