CVE-2026-9648
critical · 9.1The 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.
9.1
CVSS
0.2%
EPSS (exploit prob.)
13th
EPSS percentile
2026-06-11
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://github.com/haskell/security-advisories/pull/332
- https://github.com/kazu-yamamoto/crypton-certificate/pull/30
- https://github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39
- https://hackage.haskell.org/package/crypton-x509-validation-1.9.1/revisions/
- https://www.kb.cert.org/vuls/id/862559
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-9648