CVE-2026-27138: Golang Go

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

Affected products

• Golang Go: version 1.26.0 only

Published 2026-03-06. Last modified 2026-06-17.