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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Fixes

Solution

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Workaround

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History

Thu, 11 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 11 Jun 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title CVE-2026-9648
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published:

Updated: 2026-06-11T15:39:31.210Z

Reserved: 2026-05-26T19:26:04.460Z

Link: CVE-2026-9648

cve-icon Vulnrichment

Updated: 2026-06-11T15:10:30.272Z

cve-icon NVD

Status : Received

Published: 2026-06-11T16:16:25.503

Modified: 2026-06-11T17:16:36.177

Link: CVE-2026-9648

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

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