Technology · crates.io
pyo3 (crates.io) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 13 vulnerabilities in pyo3 (crates.io): 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, PyO3 missing Sync bound in PyCFunction new_closure, was published on 12 June 2026.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 0
- Exploited in the wild
- 0
About pyo3 (crates.io)
Rust bindings for the Python interpreter, allowing the creation of native Python extensions.
Latest pyo3 (crates.io) vulnerabilities
- PyO3 missing Sync bound in PyCFunction new_closuremediumCVSS 6.3
- PyO3 out-of-bounds read in list and tuple iteratorshighCVSS 8.7
- RUSTSEC-2026-0176 - Out-of-bounds read in `nth` / `nth_back` for `PyList` and `PyTuple` iteratorsinfo
- RUSTSEC-2026-0177 - Missing `Sync` bound on `PyCFunction::new_closure` closuresinfo
- PyO3 has type confusion when accessing data from sublasses of subclasses of native types with `abi3` featuremediumCVSS 4
- RUSTSEC-2026-0013 - Type confusion when accessing data from sublasses of subclasses of native types with `abi3`…info
- PyO3 Risk of buffer overflow in `PyString::from_object`mediumCVSS 4
- RUSTSEC-2025-0020 - Risk of buffer overflow in `PyString::from_object`info
- Build corruption when using `PYO3_CONFIG_FILE` environment variableinfo
- RUSTSEC-2024-0409 - Build corruption when using `PYO3_CONFIG_FILE` environment variableinfo
- Duplicate Advisory: PyO3 has a risk of use-after-free in `borrowed` reads from Python weak referencesmediumCVSS 4
- CVE-2024-9979: RUSTSEC-2024-0378 - Risk of use-after-free in `borrowed` reads from Python weak referenceslowCVSS 3.1EPSS 0.2%
- CVE-2020-35917: RUSTSEC-2020-0074 - Reference counting error in `From<Py<T>>`lowCVSS 3.1EPSS 0.4%
Most severe pyo3 (crates.io) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- PyO3 out-of-bounds read in list and tuple iteratorshighCVSS 8.7
- PyO3 missing Sync bound in PyCFunction new_closuremediumCVSS 6.3
- PyO3 has type confusion when accessing data from sublasses of subclasses of native types with `abi3` featuremediumCVSS 4
- PyO3 Risk of buffer overflow in `PyString::from_object`mediumCVSS 4
- Duplicate Advisory: PyO3 has a risk of use-after-free in `borrowed` reads from Python weak referencesmediumCVSS 4
- CVE-2020-35917: RUSTSEC-2020-0074 - Reference counting error in `From<Py<T>>`lowCVSS 3.1EPSS 0.4%
- CVE-2024-9979: RUSTSEC-2024-0378 - Risk of use-after-free in `borrowed` reads from Python weak referenceslowCVSS 3.1EPSS 0.2%
- RUSTSEC-2026-0176 - Out-of-bounds read in `nth` / `nth_back` for `PyList` and `PyTuple` iteratorsinfo
- RUSTSEC-2026-0177 - Missing `Sync` bound on `PyCFunction::new_closure` closuresinfo
- RUSTSEC-2026-0013 - Type confusion when accessing data from sublasses of subclasses of native types with `abi3`…info
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many pyo3 (crates.io) vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/pyo3)<a href="https://junglewise.ai/threats/technologies/pyo3"><img src="https://junglewise.ai/threats/technologies/pyo3/badge.svg" alt="pyo3 (crates.io) vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/pyo3.json, and this page as text at https://junglewise.ai/threats/technologies/pyo3.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "pyo3 (crates.io) vulnerabilities", https://junglewise.ai/threats/technologies/pyo3, 9 November 2026.