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PyO3 has type confusion when accessing data from sublasses of subclasses of native types with `abi3` featureGHSA-47qc-857f-7w7f

Fix: PyO3/pyo3#5807

GHSA-47qc-857f-7w7f is a remote code execution vulnerability in pyo3. A fix is available for pyo3 — see the affected versions and patch details below.

Also known asRUSTSEC-2026-0013
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Feb 23, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀pyo3

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iopyo3≥ 0.28.0&&< 0.28.20.28.2cargo update -p pyo3 --precise 0.28.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pyo3, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update pyo3 to 0.28.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-47qc-857f-7w7f is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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