CVE-2026-9648 json
CVE-2026-9648
published 5mo ago modified 16d 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 13%
- 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
- github.com/kazu-yamamoto/crypton-certificate#30 pull request
- github.com/kazu-yamamoto/crypton-certificate#30 pull request
- github.com/haskell/security-advisories#332 pull request
Is CVE-2026-9648 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-11).
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
-
github.com
/kazu-yamamoto/crypton-certificate/pull/30
patch
- github.com /kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39
- github.com /haskell/security-advisories/pull/332
- hackage.haskell.org /package/crypton-x509-validation-1.9.1/revisions/
-
kb.cert.org
/vuls/id/862559
advisory
Sources
- CVE List CVE-2026-9648
- NVD CVE-2026-9648
- OSV HSEC-2026-0008
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.