CVE-2020-36323: Fedoraproject Fedora

High severity, CVSS 8.2. EPSS: 2% chance of exploitation in the next 30 days.

In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.

Affected products

• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Rust-Lang Rust: before 1.52.0 (fixed in 1.52.0)

Published 2021-04-14. Last modified 2026-06-17.