CVE-2021-28032: Nano Arena Project Nano Arena

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

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.

Affected products

• Nano Arena Project Nano Arena: before 0.5.2 (fixed in 0.5.2)

Published 2021-03-05. Last modified 2026-06-17.