PyO3 has type confusion when accessing data from sublasses of subclasses of native types with `abi3` feature
Priority LOW 38CWE-843Published · Updated
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
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.
Why it matters now
Fix Fixed pyo3 (crates.io): 0.28.2
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | pyo3 (crates.io) | 0.28.0 to before 0.28.2 | 0.28.2 | Patch available | GHSA-47qc-857f-7w7f |
- pyo3 (crates.io) Vendor— Affected 0.28.0 to before 0.28.2 Fixed in 0.28.2 Patch available GHSA-47qc-857f-7w7f
Remediation
- Fix · GHSA-47qc-857f-7w7f pyo3 (crates.io) Fixed in 0.28.2 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-47qc-857f-7w7f
References
Sources
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