CVE-2026-74901

critical · 9.3

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.

9.3

CVSS

0.4%

EPSS (exploit prob.)

32nd

EPSS percentile

2026-08-17

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-347

Affected products

Vendor	Product	Affected versions
jahlives	openssl_encrypt	< 1.4.0

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-74901