The patch of fix CVE-2019-9948 is not the final patch. In addition, two regression patches are provided in the upstream. Please refer to: Https://github.com/python/cpython/commit/b15bde8058e821b383d81fcae68b335a752083ca Https://github.com/python/cpython/commit/942c31dffbe886ff02e25a319cc3891220b8c641 Https://github.com/python/cpython/commit/d9d1045837e5356331b6d5e24cbd1286acb62b5d