CVE-2026-9648

Summary

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 Software

Weaknesses

• CWE-295: Improper Certificate Validation

ADP Enrichment

CVE Program Container

Additional References

• https://www.kb.cert.org/vuls/id/862559

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• 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://github.com/haskell/security-advisories/pull/332

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