RUSTSEC-2026-0098: Name constraints for URI names were incorrectly accepted

| Details | |
| --- | --- |
| Package | `rustls-webpki` |
| Version | `0.101.7` |
| URL | n/a |
| Patched Versions | >=0.103.12, <0.104.0-alpha.1 OR >=0.104.0-alpha.6 |
| Aliases | [GHSA-965h-392x-2mh5](https://github.com/advisories/GHSA-965h-392x-2mh5) |

Name constraints for URI names were ignored and therefore accepted.

Note this library does not provide an API for asserting URI names, and URI name constraints are otherwise not implemented. URI name constraints are now rejected unconditionally.

Since name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.

This vulnerability is identified as [GHSA-965h-392x-2mh5](https://github.com/rustls/webpki/security/advisories/GHSA-965h-392x-2mh5). Thank you to [@1seal](https://github.com/1seal) for the report.

Start by checking how this repository depends on rustls-webpki 0.101.7 and whether the dependency is used in certificate validation. Compare the declared version with the patched versions listed in the report. Done means the affected dependency or validation path is addressed and the repository's relevant checks pass, but this issue does not name files or tests.

Written by the indexing model from the issue text.