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RUSTSEC-2026-0013

Type confusion when accessing data from sublasses of subclasses of native types with abi3 feature targeting Python 3.12 and up
Reported
Issued
Package
pyo3 (crates.io)
Type
Vulnerability
Categories
Keywords
#memory-corruption
References
Patched
  • >=0.28.2
Unaffected
  • <0.28.0

Description

PyO3 0.28.1 added support for #[pyclass(extends=PyList)] struct NativeSub (and other native types) when targeting Python 3.12 and up with the abi3 feature.

It was discovered that subclasses of such classes would use the type of the subclass when attempting to access to data of NativeSub contained within Python objects, amounting to memory corruption.

PyO3 0.28.2 fixed the issue by using the type of (e.g.) NativeSub correctly.

Advisory available under CC0-1.0 license.