GHSA-rvc2-5jxq-gpcj: openssl-encrypt (CVE-2026-74890)

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 va...

CVSS 9.3 CriticalCriticalEPSS 0.0021 · 11th percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 17 Aug 2026, 11:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
openssl-encrypt	PyPI	<1.4.0	1.4.0

Identifiers

GHSA-rvc2-5jxq-gpcj · CVE-2026-74890 · PYSEC-2026-3766

Weakness (CWE)

CWE-345

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

openssl-encrypt versions before 1.4.0 have an authentication bypass in CamelliaCipher: when the PYTEST_CURRENT_TEST environment variable is set, HMAC tag generation and verification are disabled. An attacker who can execute code on the system can set that variable to produce unauthenticated ciphertext and defeat integrity protection on encrypted data. Upgrade to version 1.4.0 or later.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	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	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0021, the 11th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:38 UTC First seen by agentprime
31 Oct 2026, 14:38 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.