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DEBIAN-CVE-2026-9648

Type: advisorySource: OSV1 source record

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.

Announced 11 Jun 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-9648

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-9648

haskell-crypton-x509

Source reference: /affected/0/package/name

Affected versions: 1.7.7-1
Source reference: /affected/0/versions
1.7.7-2
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

haskell-crypton-x509

Source reference: /affected/1/package/name

Affected versions: 1.7.7-1
Source reference: /affected/1/versions
1.7.7-2
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

haskell-crypton-x509-validation

Source reference: /affected/2/package/name

Affected versions: 1.6.12-3
Source reference: /affected/2/versions
1.6.14-1
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

haskell-crypton-x509-validation

Source reference: /affected/3/package/name

Affected versions: 1.6.12-3
Source reference: /affected/3/versions
1.6.14-1
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "haskell-crypton-x509",
      "purl": "pkg:deb/debian/haskell-crypton-x509?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.7.7-1",
      "1.7.7-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9648.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "haskell-crypton-x509",
      "purl": "pkg:deb/debian/haskell-crypton-x509?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.7.7-1",
      "1.7.7-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9648.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "haskell-crypton-x509-validation",
      "purl": "pkg:deb/debian/haskell-crypton-x509-validation?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.6.12-3",
      "1.6.14-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9648.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "haskell-crypton-x509-validation",
      "purl": "pkg:deb/debian/haskell-crypton-x509-validation?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.6.12-3",
      "1.6.14-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9648.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #58431 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 18:02:19 GMT
Publisher date: Thu, 11 Jun 2026 16:16:25 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-9648 · Revision 1Source updated