CVE-2026-74901

criticalCVSS 9.8covered by 1 sourcefirst seen 2026-08-17

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.

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Exploitation outlook

Low exploitation risk0.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-74901: openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in pqc.py…nvd · 2026-08-17

External references

NVD record for CVE-2026-74901

CVE.org record

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