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.

Review how the repository declares the rustls-webpki dependency and compare its version with the patched versions listed in this issue. Start by checking the dependency metadata and existing validation tests; done means the vulnerable 0.101.7 release is no longer selected and the relevant checks pass.

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