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GHSA-xgp8-3hg3-c2mh

https://github.com/advisories/GHSA-xgp8-3hg3-c2mh

Severity

2.2

Low

CVSS V3

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Summary

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

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.

References

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

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