CVE-2026-9648

CVE-2026-9648

Published Jun 11, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Haskell Programming Language
Haskell Programming Language crypton-certificate
Vendors & Products Haskell Programming Language
Haskell Programming Language crypton-certificate
Type Values Removed Values Added
Weaknesses CWE-295
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'}

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
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Jun 11, 2026, 3:39 PM
Reserved
May 26, 2026, 7:26 PM
Status
Deferred
Published
Jun 11, 2026, 4:16 PM
Modified
Oct 26, 2026, 11:10 AM