Update Framework python-tuf up to 6.x Path Pattern Matching tuf/api/_payload.py DelegatedRole._is_target_in_pathpattern improper authorization

Summaryinfo

A vulnerability has been found in Update Framework python-tuf up to 6.x and classified as problematic. The affected element is the function DelegatedRole._is_target_in_pathpattern of the file tuf/api/_payload.py of the component Path Pattern Matching. The manipulation leads to improper authorization. This vulnerability is listed as CVE-2026-123806. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Update Framework python-tuf up to 6.x and classified as problematic. This issue affects the function DelegatedRole._is_target_in_pathpattern of the file tuf/api/_payload.py of the component Path Pattern Matching. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-123806 since 11/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 7.0.0 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Programming Language Software

Vendor

• Update Framework

Name

• python-tuf

Version

• 6.x

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion