UBUNTU-CVE-2026-123806

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Source

https://ubuntu.com/security/CVE-2026-123806

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123806.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-123806

Upstream

CVE-2026-123806

Published

2026-05-28T22:46:13Z

Modified

2026-11-11T09:39:20Z

Severity

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

Summary

[none]

Details

python-tuf is a Python reference implementation of The Update Framework (TUF). Prior to 7.0.0, DelegatedRole._is_target_in_pathpattern in tuf/api/_payload.py uses fnmatch.fnmatch, which applies os.path.normcase before matching and makes delegation path authorization case-insensitive on Windows. When a TUF repository has path-based delegations that differ only by case and an attacker-controlled role is visited before the legitimate role, ngclient can accept an attacker-provided target from the wrong delegation for a requested path. Linux and macOS clients are not affected because their path normalization does not change case. This issue is fixed in 7.0.0.

References

Affected packages

Ubuntu:26.10 / python-tuf

Package

Name: python-tuf
Purl: pkg:deb/ubuntu/python-tuf?arch=source&distro=stonking

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

6.*

6.0.0-2

7.*

7.0.0-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-tuf",
            "binary_version": "7.0.0-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123806.json"

Ubuntu:26.04:LTS / python-tuf