Critical severity9.1NVD Advisory· Published Jun 11, 2026· Updated Jun 11, 2026
CVE-2026-9648
CVE-2026-9648
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16- osv-coords14 versionspkg:hackage/crypton-x509pkg:hackage/crypton-x509-validationpkg:hackage/x509pkg:hackage/x509-validationpkg:rpm/opensuse/ghc-aws&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-asn1-encoding&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-asn1-parse&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-asn1-types&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-pem&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-x509&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-x509-store&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-x509-system&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ghc-crypton-x509-validation&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/git-annex&distro=openSUSE%20Tumbleweed
>= 1.7.6, < 1.9.1+ 13 more
- (no CPE)range: >= 1.7.6, < 1.9.1
- (no CPE)range: >= 1.6.12, < 1.9.1
- (no CPE)range: >= 1.4.0
- (no CPE)range: >= 1.4.0
- (no CPE)range: < 0.25.2-1.1
- (no CPE)range: < 0.10.0-1.1
- (no CPE)range: < 0.10.0-1.1
- (no CPE)range: < 0.4.1-1.1
- (no CPE)range: < 0.3.0-1.1
- (no CPE)range: < 1.9.1-1.1
- (no CPE)range: < 1.9.0-1.1
- (no CPE)range: < 1.9.0-1.1
- (no CPE)range: < 1.9.1-1.1
- (no CPE)range: < 10.20260601-2.1
Patches
Vulnerability mechanics
References
5- github.com/haskell/security-advisories/pull/332nvd
- github.com/kazu-yamamoto/crypton-certificate/pull/30nvd
- github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39nvd
- hackage.haskell.org/package/crypton-x509-validation-1.9.1/revisions/nvd
- www.kb.cert.org/vuls/id/862559nvd
News mentions
1- ⚡ Weekly Recap: Chrome 0-Day, UniFi Exploits, macOS Stealers, VPN Flaw and MoreThe Hacker News · Jun 15, 2026