UBUNTU-CVE-2026-69248

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Source
https://ubuntu.com/security/CVE-2026-69248
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69248.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-69248
Upstream
Published
2026-08-03T22:16:00Z
Modified
2026-09-10T21:30:16Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:P CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of *.example.com, python-cryptography's verifier accepts which allows escaping outside of the permitted names. The core issue is in DNSConstraint::matches, where a wildcard pattern was treated as matching a more-specific permitted constraint even though *.example.com can expand to sibling names such as bar.example.com outside foo.example.com. This allows acceptance of an invalid certificate chain. This issue is fixed in 49.0.0.

References

Affected packages

Ubuntu:26.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

43.*
43.0.0-1ubuntu1
46.*
46.0.1-1ubuntu2
46.0.5-1ubuntu1
46.0.5-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-cryptography",
            "binary_version": "46.0.5-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69248.json"