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Fencer Vulns
critical 9.1

CVE-2026-9648 json

CVE-2026-9648

published 2026-06-03 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-36248 , HSEC-2026-0008

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

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.

Patch / fix

  • hackage crypton-x509-validation 1.9.1
  • hackage crypton-x509 1.9.1
  • Haskell Programming Language crypton-certificate 1.9.1
  • ghc-aws openSUSE Tumbleweed 0.25.2-1.1
  • ghc-crypton-asn1-encoding openSUSE Tumbleweed 0.10.0-1.1
  • ghc-crypton-asn1-parse openSUSE Tumbleweed 0.10.0-1.1
  • ghc-crypton-asn1-types openSUSE Tumbleweed 0.4.1-1.1
  • ghc-crypton-pem openSUSE Tumbleweed 0.3.0-1.1
  • ghc-crypton-x509 openSUSE Tumbleweed 1.9.1-1.1
  • ghc-crypton-x509-store openSUSE Tumbleweed 1.9.0-1.1
  • ghc-crypton-x509-system openSUSE Tumbleweed 1.9.0-1.1

opensuse advisories openSUSE-SU-2026:11077-1openSUSE-SU-2026:11078-1openSUSE-SU-2026:11079-1openSUSE-SU-2026:11080-1openSUSE-SU-2026:11081-1openSUSE-SU-2026:11082-1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
hackage crypton-x509-validation
>=1.6.12, <1.9.1
1.9.1
hackage crypton-x509
>=1.7.6, <1.9.1
1.9.1
hackage x509-validation
>=1.4.0
 no fix listed
hackage x509
>=1.4.0
 no fix listed

Affected products

  • Haskell Programming Language crypton-certificate

References

Sources

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