CVE-2026-74890openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variable
Updated under an hour ago ()
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It affects jahlives openssl_encrypt. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-345
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Oct 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
jahlives openssl_encrypt jahlives:openssl_encrypt (from the name) | before 1.4.0; 1.4.0 not affected | CNA record |
jahlives openssl_encrypt jahlives:openssl_encrypt | before 1.4.0 | NVD |
References
- https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-rvc2-5jxq-gpcjvendor-advisory, mitigation
- https://www.vulncheck.com/advisories/openssl-encrypt-before-hmac-authentication-bypass-via-environment-variablethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.