CVE-2026-74890

openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variable

State: Published
Severity: 9.3 Critical
Published: Aug 17, 2026
Updated: Oct 1, 2026
Reserved: Aug 17, 2026

Description

openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set. Attackers with code execution can set this environment variable to produce unauthenticated ciphertext and bypass integrity protection on encrypted data.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	VulnCheck
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	VulnCheck

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
openssl_encryptjahlives	before 1.4.0Affected 1.4.0Not affected

References

GitHub Security Advisory (GHSA-rvc2-5jxq-gpcj)vendor-advisory
VulnCheck Advisory: openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variablethird-party-advisory

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