by Kastro
Paper/Archive/CVE-2026-74890

CVE-2026-74890

jahlives openssl_encrypt — openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variable

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
30
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 11.7.117 × 202.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
openssl_encrypt< 1.4.01.4.0CNA

Scores by source

VulnCheck (CNA)9.3CVSS: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 (CNA)5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

advisorygithub.com/jahlives/openssl_encrypt/security/advisories/GHSA-rvc2-5jxq-gpcjwriteupvulncheck.com/advisories/openssl-encrypt-before-hmac-authentication-bypass-via-environment-variable