GHSA-x38r-8wf3-q9hq: openssl-encrypt (CVE-2026-81700)

openssl_encrypt versions before 1.4.9 contain a signature verification vulnerability in gpg_runner.verify_detached that accepts revoked and expired keys by only checking VALIDSIG status without ins...

CVSS 9.3 CriticalCriticalEPSS 0.0035 · 28th percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 27 Aug 2026, 17:21 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
openssl-encrypt	PyPI	<1.4.9	1.4.9

Identifiers

GHSA-x38r-8wf3-q9hq · CVE-2026-81700 · PYSEC-2026-3777

Weakness (CWE)

CWE-347

Machine-written summary

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

openssl-encrypt versions before 1.4.9 accept signatures made with revoked or expired GPG keys, because signature verification only checks the VALIDSIG status and ignores revocation, expiry, and gpg exit codes. An attacker holding a compromised-then-revoked signing key or an expired project key could get malicious plugins past verification and run them in the host process. Upgrade to openssl-encrypt 1.4.9.

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 0.0035, the 28th 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.