Improper Handling of Case Sensitivity in The Update Framework (TUF) - #VU131745
Published: May 18, 2026
Vulnerability identifier: #VU131745
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-178
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: The Update Framework
Affected software:
The Update Framework (TUF)
The Update Framework (TUF)
Detailed vulnerability description
The vulnerability allows a remote attacker to influence target authorization decisions.
The vulnerability exists due to improper handling of case sensitivity in DelegatedRole._is_target_in_pathpattern when matching delegation path patterns on Windows. A remote attacker can control a delegated role with a case-colliding path pattern to influence target authorization decisions.
Exploitation requires a repository configuration with path-based delegations whose patterns differ only by case, the attacker-controlled delegation to be visited before the legitimate delegation, and a client running on Windows.
Remediation
Install security update from vendor's website.