{"cve":"CVE-2021-28032","nvd":{"published":"2021-03-05T09:15:14.097","modified":"2026-06-17T03:45:45.043","status":"Modified","description":"An issue was discovered in the nano_arena crate before 0.5.2 for Rust. There is an aliasing violation in split_at because two mutable references can exist for the same element, if Borrow<Idx> behaves in certain ways. This can have a resultant out-of-bounds write or use-after-free.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://rustsec.org/advisories/RUSTSEC-2021-0031.html","https://rustsec.org/advisories/RUSTSEC-2021-0031.html"],"products":["nano_arena_project:nano_arena"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-28032","score":0.01528,"percentile":0.74713,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-wp34-mqw5-jj85","url":"https://osv.dev/vulnerability/GHSA-wp34-mqw5-jj85","summary":"Use after free in nano_arena","modified":"2023-11-08T04:05:27.788398Z","packages":[{"ecosystem":"crates.io","name":"nano_arena","purl":"pkg:cargo/nano_arena","ranges":["<0.5.2"],"fixed":["0.5.2"]}]},{"id":"RUSTSEC-2021-0031","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0031","summary":"split_at allows obtaining multiple mutable references to the same data","modified":"2023-11-08T04:05:27.788398Z","packages":[{"ecosystem":"crates.io","name":"nano_arena","purl":"pkg:cargo/nano_arena","ranges":[">=0.0.0-0 <0.5.2"],"fixed":["0.5.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}