GHSA-xgp8-3hg3-c2mh

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GHSA-xgp8-3hg3-c2mh

Summary: webpki: Name constraints were accepted for certificates asserting a wildcard name

Details: Permitted subtree name constraints for DNS names were accepted for certificates asserting a wildcard name. This was incorrect because, given a name constraint of `accept.example.com`, `*.example.com` could feasibly allow a name of `reject.example.com` which is outside the constraint. This is very similar to [CVE-2025-61727](https://go.dev/issue/76442). Since name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.

References: https://github.com/rustls/webpki/security/advisories/GHSA-xgp8-3hg3-c2mh, https://github.com/rustls/webpki, https://rustsec.org/advisories/RUSTSEC-2026-0099.html