CVE-2026-42508: Golang Crypto

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.

Affected products

• Golang Crypto: before 0.52.0 (fixed in 0.52.0)

Published 2026-05-22. Last modified 2026-09-15.