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GHSA-xgp8-3hg3-c2mh: webpki: Name constraints were accepted for certificates asserting a wildcard name

April 16, 2026

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

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

Code Behaviors & Features

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Affected versions

All versions starting from 0.101.0 before 0.103.12, all versions starting from 0.104.0-alpha.1 before 0.104.0-alpha.6

Fixed versions

  • 0.103.12
  • 0.104.0-alpha.6

Solution

Upgrade to versions 0.103.12, 0.104.0-alpha.6 or above.

Impact 2.2 LOW

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-295: Improper Certificate Validation

Source file

cargo/rustls-webpki/GHSA-xgp8-3hg3-c2mh.yml

Spotted a mistake? Edit the file on GitLab.

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