CVE-2026-9648
Last modified
CVE-2026-9648 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
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.
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Timeline
- Published
- Last Modified
- Status
- Deferred
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