CVE Explorer
CVE-2026-9648
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"crypton-certificate","vendor":"Haskell Programming Language","versions":[{"lessThan":"1.9.1","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/adp/1/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"description":"CWE-295: Improper Certificate Validation","lang":"en"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"url":"https://github.com/haskell/security-advisories/pull/332"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/cna/references/3
{"url":"https://github.com/kazu-yamamoto/crypton-certificate/pull/30"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/cna/references/0
{"url":"https://github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/cna/references/1
{"url":"https://hackage.haskell.org/package/crypton-x509-validation-1.9.1/revisions/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/cna/references/2
{"url":"https://www.kb.cert.org/vuls/id/862559"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0c0d1360c512f3338310ad049fd436724c48158f41bc6e2f380f5efda8b97df0 · sha256:d46bec3d7a8371f3… · /containers/adp/0/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.