CVE-2026-74901
Critical · 9.8CVSS
9.8
EPSS
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Published
Aug 17, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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