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CVE-2026-9648

CVE-2026-9648

Published: Jun 11, 2026Updated: Jun 11, 2026 Sources: CVE List NVD
NVD MITRE
9.1CVSS
CRITICAL

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 Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None

Affected Products

crypton-certificate
Haskell Programming Language
OSS Libraries / generic-library
haskell programming languageoss-projectOSS Libraries

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/haskell/security-advisories/pull/332
github.com
https://github.com/kazu-yamamoto/crypton-certificate/pull/30
github.com
https://github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39
github.com
and 2 more references View all →

Timeline

Published
Jun 11, 2026
Last Updated
Jun 11, 2026

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