CVE-2026-81700CWE-347

CVE-2026-81700

Critical · published August 27, 2026

CVSS v3.1

9.8

EPSS

Percentile

27.5

In the wild

Unconfirmed

What it is

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 inspecting REVKEYSIG, EXPKEYSIG, or gpg exit codes. Attackers holding compromised-then-revoked signing keys or expired project keys can bypass signature verification to execute malicious plugins in the host process.

The record

Technical detail

CVSS v3.1: 9.8 · CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0: 9.3 · 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
EPSS: 0.00351 · 27.5th percentile
Weakness: CWE-347 · Improper Verification of Cryptographic Signature
Published: 2026-08-27T21:21Z

Affected products (1)

Product	Versions	Fixed in
jahlives/openssl_encrypt	< 1.4.9	1.4.9

References (2)

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-x38r-8wf3-q9hq · [email protected]https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-gpg-signature-verification-bypass · [email protected]

EPSS history

Timeline

27 AUG 14:51Z
openssl_encrypt before 1.4.9 GPG Signature Verification Bypass
cvelistv5