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
Downstream
Related
Published
2026-08-03T22:16:00Z
Modified
2026-09-17T19:54:56Z
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. In versions 45.0.0 through 48.0.0, 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
Fixed
46.0.5-1ubuntu2.2

Affected versions

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "python3-cryptography",
            "binary_version": "46.0.5-1ubuntu2.2"
        }
    ]
}

Database specific

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