Panic in name constraint checking for malformed certificates in crypto/x509

GO-2026-4600 · BIT-golang-2026-27138 · CVE-2026-27138

Published Mar 6, 2026 · Modified May 15, 2026

Description

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.

References

WEB https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
REPORT https://go.dev/issue/77953
FIX https://go.dev/cl/752183

Ready to move

Start Securing

Start for Free Get Demo

Free, no credit card | First findings in minutes