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CVE-2026-9648

CRITICAL
9.1
CVSS Severity Score
EPSS Score0.1560%
EPSS Percentile3.80th
PublishedJun 11, 2026
Last ModifiedJun 11, 2026

Vulnerability 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.

Affected Platforms (CPE)

No CPE configurations currently published for this record.

References & Advisories

🔗 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

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