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VulnerabilityPublished

CVE-2026-9648: Haskell Programming Language crypton-certificate · Improper Certificate Validation

Affects Haskell Programming Language crypton-certificateSource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical : upgrade to 1.9.1 as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade Haskell Programming Language crypton-certificate to 1.9.1.

Affected software

ProductAffectedFixed in
Haskell Programming Languagecrypton-certificateAffected
  • <1.9.1
Fixed in
  • 1.9.1

AI-suggested

If you cannot patch yet, users should consider alternative certificate validation methods or libraries that properly enforce X.509 NameConstraints.

Description

The crypton-x509-validation Haskell library does not properly enforce X.509 NameConstraints, allowing TLS clients to accept certificates with Subject Alternative Names outside the permitted subtrees of the issuing CA. This vulnerability enables an attacker who compromises a name-constrained sub-CA to impersonate domains beyond its intended scope. The issue is classified under CWE-295 (Improper Certificate Validation) and has a critical CVSS score of 9.1.

References

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