CVE-2026-9648

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Summary

CVECVE-2026-9648
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-11 16:16:25 UTC
Updated2026-06-11 17:16:36 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-295: Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Haskell Programming Language Crypton-certificate affected 1.9.1 custom Not specified

References

ReferenceSourceLinkTags
hackage.haskell.org/package/crypton-x509-validation-1.9.1/revisions [email protected] hackage.haskell.org
github.com/kazu-yamamoto/crypton-certificate/pull/30 [email protected] github.com
github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ea... [email protected] github.com
github.com/haskell/security-advisories/pull/332 [email protected] github.com
www.kb.cert.org/vuls/id/862559 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
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