Vulnerabilities CVE-2026-74901

CVE-2026-74901

Critical

Open

TLP:CLEAR

openssl_encrypt before 1.4.0 Authentication Bypass via AES-CTR Fallback

NVD CVE.org

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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.

Details

CVSS Score: 9.3
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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