Use After Free in Pyo3 Project

CVE-2020-35917

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>>.

Vulnerability class: Use-After-Free

EPSS: 0.004 (31.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Pyo3_project Pyo3
N/a — versions n/a

Weakness classification (CWE)

CWE-416 — Use After Free

Public proof-of-concept exploits

Artisan-Lab/Rust-memory-safety-bugs

References

cve@mitre.org (Exploit, Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-35917?: CVE-2020-35917 is a medium-severity vulnerability in Pyo3 Project, classified under Use After Free. CVSS score: 5.5/10. Published 2020-12-31.
How severe is CVE-2020-35917?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2020-35917 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.