cpython is unmaintained (#1822)

Author: decathorpe

crates/cpython/RUSTSEC-0000-0000.md

@@ -0,0 +1,38 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "cpython"
+date = "2023-11-14"
+url = "https://github.com/dgrunwald/rust-cpython/commit/e815555"
+references = [
+    "https://github.com/dgrunwald/rust-cpython/issues/265",
+    "https://github.com/dgrunwald/rust-cpython/issues/294",
+]
+informational = "unmaintained"
+
+[versions]
+patched = []
+```
+
+# `cpython` is unmaintained
+
+The `cpython` crate and the underlying `python3-sys` and `python27-sys` crates have been marked as [no longer actively maintained] by the developer.
+
+There are also open issues for unsound code that is currently in these crates:
+
+- [cpython#265]: Using some string functions causes segmentation faults on big-endian architectures. Due to incorrect bitfield manipulations, it is possible to create invalid Python objects that crash the Python interpreter.
+- [cpython#294]: Python 3.12 is not supported. Due to ABI changes in Python 3.12, calling some string functions will result in invalid Python objects and / or cause out-of-bounds memory accesses.
+
+## Recommended alternatives
+
+- [`pyo3`] (version 0.19.2 and newer)
+
+The `pyo3` crate is actively maintained. Preliminary support for Python 3.12 was added in version 0.19.2, and version 0.20.0 was released with full support for Python 3.12.
+
+Both versions implement string functions correctly on big-endian architectures. The endianness issue affecting the `cpython` crate was fixed in recent versions of `pyo3`.
+
+[no longer actively maintained]: https://github.com/dgrunwald/rust-cpython/commit/e815555
+[cpython#265]: https://github.com/dgrunwald/rust-cpython/issues/265
+[cpython#294]: https://github.com/dgrunwald/rust-cpython/issues/294
+[`pyo3`]: https://crates.io/crates/pyo3
+