Hi,

The following vulnerability was published for haskell-crypton-x509-validation.

CVE-2026-9648[0]:
| The crypton-x509-validation Haskell library fails to enforce X.509
| NameConstraints, allowing TLS clients to accept certificates whose
| Subject Alternative Names fall outside the issuing CA’s permitted
| subtrees. This oversight enables an attacker who compromises a name-
| constrained sub-CA to impersonate domains beyond its intended scope.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-9648
https://www.cve.org/CVERecord?id=CVE-2026-9648
[1] https://www.kb.cert.org/vuls/id/862559
[2] https://github.com/kazu-yamamoto/crypton-certificate/pull/30
[3] https://github.com/kazu-yamamoto/crypton-certificate/commit/f4b77edf6ead77f4a886da40e41eab20f0180e39

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore