# pyo3 (crates.io) vulnerabilities Source: https://junglewise.ai/threats/technologies/pyo3 Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/pyo3.json License: CC BY 4.0 with a link back 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. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 0 - All time: 13 (0 critical, 0 exploited in the wild) ## 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_closure](https://junglewise.ai/threats/pyo3-missing-sync-bound-in-pycfunction-new-closure-37dd6bc7) (medium, CVSS 6.3, published 12 Jun 2026) - [PyO3 out-of-bounds read in list and tuple iterators](https://junglewise.ai/threats/pyo3-out-of-bounds-read-in-list-and-tuple-iterators-31441968) (high, CVSS 8.7, published 12 Jun 2026) - [RUSTSEC-2026-0176 - Out-of-bounds read in `nth` / `nth_back` for `PyList` and `PyTuple` iterators](https://junglewise.ai/threats/rustsec-2026-0176-out-of-bounds-read-in-nth-nth-back-for-pylist-and-f3042ce7) (info, published 11 Jun 2026) - [RUSTSEC-2026-0177 - Missing `Sync` bound on `PyCFunction::new_closure` closures](https://junglewise.ai/threats/rustsec-2026-0177-missing-sync-bound-on-pycfunction-new-closure-e8081edc) (info, published 11 Jun 2026) - [PyO3 has type confusion when accessing data from sublasses of subclasses of native types with `abi3` feature](https://junglewise.ai/threats/pyo3-has-type-confusion-when-accessing-data-from-sublasses-of-2db99dde) (medium, CVSS 4, published 19 Feb 2026) - [RUSTSEC-2026-0013 - Type confusion when accessing data from sublasses of subclasses of native types with `abi3`…](https://junglewise.ai/threats/rustsec-2026-0013-type-confusion-when-accessing-data-from-sublasses-of-d320236a) (info, published 18 Feb 2026) - [PyO3 Risk of buffer overflow in `PyString::from_object`](https://junglewise.ai/threats/pyo3-risk-of-buffer-overflow-in-pystring-from-object-2cfae0bc) (medium, CVSS 4, published 2 Apr 2025) - [RUSTSEC-2025-0020 - Risk of buffer overflow in `PyString::from_object`](https://junglewise.ai/threats/rustsec-2025-0020-risk-of-buffer-overflow-in-pystring-from-object-00351e9a) (info, published 1 Apr 2025) - [Build corruption when using `PYO3_CONFIG_FILE` environment variable](https://junglewise.ai/threats/build-corruption-when-using-pyo3-config-file-environment-variable-cb118867) (info, published 5 Dec 2024) - [RUSTSEC-2024-0409 - Build corruption when using `PYO3_CONFIG_FILE` environment variable](https://junglewise.ai/threats/rustsec-2024-0409-build-corruption-when-using-pyo3-config-file-baa2bd6f) (info, published 4 Dec 2024) - [Duplicate Advisory: PyO3 has a risk of use-after-free in `borrowed` reads from Python weak references](https://junglewise.ai/threats/duplicate-advisory-pyo3-has-a-risk-of-use-after-free-in-borrowed-reads-0a52725d) (medium, CVSS 4, published 15 Oct 2024) - [CVE-2024-9979: RUSTSEC-2024-0378 - Risk of use-after-free in `borrowed` reads from Python weak references](https://junglewise.ai/threats/cve-2024-9979-pyo3-has-a-risk-of-use-after-free-in-borrowed-reads-from-python) (low, CVSS 3.1, published 12 Oct 2024) - [CVE-2020-35917: RUSTSEC-2020-0074 - Reference counting error in `From>`](https://junglewise.ai/threats/cve-2020-35917-reference-counting-error-in-pyo3) (low, CVSS 3.1, published 28 Nov 2020) ## Most severe pyo3 (crates.io) vulnerabilities - [PyO3 out-of-bounds read in list and tuple iterators](https://junglewise.ai/threats/pyo3-out-of-bounds-read-in-list-and-tuple-iterators-31441968) (high, CVSS 8.7, published 12 Jun 2026) - [PyO3 missing Sync bound in PyCFunction new_closure](https://junglewise.ai/threats/pyo3-missing-sync-bound-in-pycfunction-new-closure-37dd6bc7) (medium, CVSS 6.3, published 12 Jun 2026) - [PyO3 has type confusion when accessing data from sublasses of subclasses of native types with `abi3` feature](https://junglewise.ai/threats/pyo3-has-type-confusion-when-accessing-data-from-sublasses-of-2db99dde) (medium, CVSS 4, published 19 Feb 2026) - [PyO3 Risk of buffer overflow in `PyString::from_object`](https://junglewise.ai/threats/pyo3-risk-of-buffer-overflow-in-pystring-from-object-2cfae0bc) (medium, CVSS 4, published 2 Apr 2025) - [Duplicate Advisory: PyO3 has a risk of use-after-free in `borrowed` reads from Python weak references](https://junglewise.ai/threats/duplicate-advisory-pyo3-has-a-risk-of-use-after-free-in-borrowed-reads-0a52725d) (medium, CVSS 4, published 15 Oct 2024) - [CVE-2020-35917: RUSTSEC-2020-0074 - Reference counting error in `From>`](https://junglewise.ai/threats/cve-2020-35917-reference-counting-error-in-pyo3) (low, CVSS 3.1, published 28 Nov 2020) - [CVE-2024-9979: RUSTSEC-2024-0378 - Risk of use-after-free in `borrowed` reads from Python weak references](https://junglewise.ai/threats/cve-2024-9979-pyo3-has-a-risk-of-use-after-free-in-borrowed-reads-from-python) (low, CVSS 3.1, published 12 Oct 2024) - [RUSTSEC-2026-0176 - Out-of-bounds read in `nth` / `nth_back` for `PyList` and `PyTuple` iterators](https://junglewise.ai/threats/rustsec-2026-0176-out-of-bounds-read-in-nth-nth-back-for-pylist-and-f3042ce7) (info, published 11 Jun 2026) - [RUSTSEC-2026-0177 - Missing `Sync` bound on `PyCFunction::new_closure` closures](https://junglewise.ai/threats/rustsec-2026-0177-missing-sync-bound-on-pycfunction-new-closure-e8081edc) (info, published 11 Jun 2026) - [RUSTSEC-2026-0013 - Type confusion when accessing data from sublasses of subclasses of native types with `abi3`…](https://junglewise.ai/threats/rustsec-2026-0013-type-confusion-when-accessing-data-from-sublasses-of-d320236a) (info, published 18 Feb 2026) ## Vulnerabilities per week Nothing was published in the last eight weeks. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other crates.io technologies - [surrealdb (crates.io)](https://junglewise.ai/threats/technologies/surrealdb): 83 vulnerabilities - [wasmtime (crates.io)](https://junglewise.ai/threats/technologies/wasmtime): 67 vulnerabilities - [deno (crates.io)](https://junglewise.ai/threats/technologies/deno): 39 vulnerabilities - [zebrad (crates.io)](https://junglewise.ai/threats/technologies/zebrad): 27 vulnerabilities - [russh (crates.io)](https://junglewise.ai/threats/technologies/crates-io-russh): 26 vulnerabilities - [openssl-src (crates.io)](https://junglewise.ai/threats/technologies/openssl-src): 26 vulnerabilities - [openssl (crates.io)](https://junglewise.ai/threats/technologies/crates-io-openssl): 25 vulnerabilities - [rustfs (crates.io)](https://junglewise.ai/threats/technologies/rustfs): 25 vulnerabilities - [coreutils (crates.io)](https://junglewise.ai/threats/technologies/crates-io-coreutils): 21 vulnerabilities - [ckb (crates.io)](https://junglewise.ai/threats/technologies/ckb): 19 vulnerabilities - [apollo-router (crates.io)](https://junglewise.ai/threats/technologies/apollo-router): 13 vulnerabilities - [deepseek-tui (crates.io)](https://junglewise.ai/threats/technologies/deepseek-tui): 13 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "pyo3 (crates.io) vulnerabilities", https://junglewise.ai/threats/technologies/pyo3, 9 November 2026.