CVEvulnerability
CVE-2026-9648
9.1 CRITICAL
Official page ↗
- Status
- Deferred
- Published
- 2026-06-11
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
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.
References
- https://github.com/haskell/security-advisories/pull/332 github.com
- https://github.com/kazu-yamamoto/crypton-certificate/pull/30 github.com
- https://github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39 github.com
- https://hackage.haskell.org/package/crypton-x509-validation-1.9.1/revisions/ hackage.haskell.org
- https://www.kb.cert.org/vuls/id/862559 www.kb.cert.org