Vulnerability intelligence

CVE-2026-9648

Haskell Programming Language crypton-certificate

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.

CVSS Score

9.1

Critical

EPSS — Exploit Probability

0.2%

Riskier than 13% of all CVEs · checked 2026-09-13

Exploitation

Not in CISA KEV

KEV does not include every exploited vulnerability

Remediation

unknown

Check vendor advisories

NVD entry PoC / advisory

1 article across 1 outlet · first covered Jun 16, 2026 · latest Jun 16, 2026

Coverage timeline

Haskell TLS flaw allows forged certificates, CVE-2026-9648
securityonline.info · Jun 16, 2026