If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.Referenceshttps://github.com/python/cpython/issues/136065https://mail.python.org/archives/list/security-announce@python.org/thread/IUP5QJ6D4KK6ULHOMPC7DPNKRYQTQNLA/https://github.com/python/cpython/commit/2e6150adccaaf5bd95d4c19dfd04a36e0b325d8chttps://github.com/python/cpython/commit/631ba3407e3348ccd56ce5160c4fb2c5dc5f4d84https://github.com/python/cpython/commit/892747b4cf0f95ba8beb51c0d0658bfaa381ebcahttps://github.com/python/cpython/commit/9ab89c026aa9611c4b0b67c288b8303a480fe742https://github.com/python/cpython/commit/c8a5f3435c342964e0a432cc9fb448b7dbecd1bahttps://github.com/python/cpython/commit/f029e8db626ddc6e3a3beea4eff511a71aaceb5chttps://github.com/python/cpython/commit/5dceb93486176e6b4a6d9754491005113eb23427
