UBUNTU-CVE-2026-9648

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Source

https://ubuntu.com/security/CVE-2026-9648

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9648.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-9648

Upstream

CVE-2026-9648

Published

2026-06-11T16:16:00Z

Modified

2026-06-17T04:26:58Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:24.04:LTS / haskell-crypton-x509-validation

Package

Name: haskell-crypton-x509-validation
Purl: pkg:deb/ubuntu/haskell-crypton-x509-validation?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.6.12-1

1.6.12-2

1.6.12-2build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libghc-crypton-x509-validation-prof",
            "binary_version": "1.6.12-2build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9648.json"

Ubuntu:25.10 / haskell-crypton-x509-validation

Package

Name: haskell-crypton-x509-validation
Purl: pkg:deb/ubuntu/haskell-crypton-x509-validation?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.6.12-3build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libghc-crypton-x509-validation-prof",
            "binary_version": "1.6.12-3build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9648.json"

Ubuntu:26.04:LTS / haskell-crypton-x509-validation

Package

Name: haskell-crypton-x509-validation
Purl: pkg:deb/ubuntu/haskell-crypton-x509-validation?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.6.12-3build1

1.6.14-1build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libghc-crypton-x509-validation-prof",
            "binary_version": "1.6.14-1build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9648.json"