GitHub Advisoryadvisory · crates.io
GHSA-xgp8-3hg3-c2mh webpki: Name constraints were accepted for certificates asserting a wildcard name
LOW
Official page ↗
- Ecosystem
- crates.io
- Packages
- rustls-webpki
- Severity
- Low
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-295
- Reviewed
- 2026-04-16
Affected packages
• crates.io rustls-webpki: >= 0.101.0, < 0.103.12 → fixed in 0.103.12
• crates.io rustls-webpki: >= 0.104.0-alpha.1, < 0.104.0-alpha.6 → fixed in 0.104.0-alpha.6
Description
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.
Since name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.
Related
Weakness · CWE (1)
- CWE-295 Improper Certificate Validation weakness