{"id":"GHSA-pph8-gcv7-4qj5","summary":"PyO3 Risk of buffer overflow in `PyString::from_object`","details":"`PyString::from_object` took `&str` arguments and forwarded them directly to the Python C API without checking for terminating nul bytes. This could lead the Python interpreter to read beyond the end of the `&str` data and potentially leak contents of the out-of-bounds read (by raising a Python exception containing a copy of the data including the overflow).\n\nIn PyO3 0.24.1 this function will now allocate a `CString` to guarantee a terminating nul bytes. PyO3 0.25 will likely offer an alternative API which takes `&CStr` arguments.","aliases":["RUSTSEC-2025-0020"],"modified":"2026-09-10T03:50:23.976163491Z","published":"2025-04-02T13:19:19Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2025-04-02T13:19:19Z","nvd_published_at":null,"cwe_ids":["CWE-125"],"severity":"LOW"},"references":[{"type":"WEB","url":"https://github.com/PyO3/pyo3/issues/5005"},{"type":"WEB","url":"https://github.com/PyO3/pyo3/pull/5008"},{"type":"PACKAGE","url":"https://github.com/PyO3/pyo3"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2025-0020.html"}],"affected":[{"package":{"name":"pyo3","ecosystem":"crates.io","purl":"pkg:cargo/pyo3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.1.0"},{"fixed":"0.24.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/04/GHSA-pph8-gcv7-4qj5/GHSA-pph8-gcv7-4qj5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"}]}