An issue was discovered in the pyo3 crate before 0.12.4 for Rust.
Priority LOW 25CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-416 and the CVSS impact.
Summary
An issue was discovered in the pyo3 crate before 0.12.4 for Rust. There is a reference-counting error and use-after-free in From<Py<T>>.
Why it matters now
EPSS 0.00393 33rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed pyo3 (crates.io): 0.12.4
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | pyo3 (crates.io) | 0.12.0 to before 0.12.4 | 0.12.4 | Patch available | GHSA-2vx6-fcw6-hpr6 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- pyo3 (crates.io) Vendor— Affected 0.12.0 to before 0.12.4 Fixed in 0.12.4 Patch available GHSA-2vx6-fcw6-hpr6
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:pyo3_project:pyo3:*:*:*:*:*:rust:*:* | before 0.12.4 | Vulnerable | Pyo3 Project |
- cpe:2.3:a:pyo3_project:pyo3:*:*:*:*:*:rust:*:* Versions before 0.12.4 Vulnerable ·Pyo3 Project
Remediation
- Fix · GHSA-2vx6-fcw6-hpr6 pyo3 (crates.io) Fixed in 0.12.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-35917
- 2026-10-03 Alias added: GHSA-2vx6-fcw6-hpr6
References
Sources
- CVE-2020-35917 · CVE Program
- CVE-2020-35917 · NVD
- FIRST EPSS
- GHSA-2vx6-fcw6-hpr6 · GitHub Advisory Database · CC BY 4.0
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