{"id":"CVE-2026-123806","published":"2026-11-09T22:18:36.503","lastModified":"2026-11-09T22:18:36.503","description":"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.","cvssScore":4,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwes":["CWE-178"],"vendors":[],"products":[],"references":[{"url":"https://github.com/theupdateframework/python-tuf/commit/8ed4414946041030b264871ac41b929cf15774a5","tags":[]},{"url":"https://github.com/theupdateframework/python-tuf/releases/tag/v7.0.0","tags":[]},{"url":"https://github.com/theupdateframework/python-tuf/security/advisories/GHSA-qp9x-wp8f-qgjj","tags":[]}],"exploitRefs":[{"url":"https://github.com/theupdateframework/python-tuf/commit/8ed4414946041030b264871ac41b929cf15774a5","tags":[]},{"url":"https://github.com/theupdateframework/python-tuf/releases/tag/v7.0.0","tags":[]},{"url":"https://github.com/theupdateframework/python-tuf/security/advisories/GHSA-qp9x-wp8f-qgjj","tags":[]}],"hasPoc":true,"ai":null}