CVE-2021-29922: Rust-Lang Rust

Critical severity, CVSS 9.1. EPSS: 2.6% chance of exploitation in the next 30 days.

library/std/src/net/parser.rs in Rust before 1.53.0 does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation.

Affected products

• Rust-Lang Rust: before 1.53.0 (fixed in 1.53.0)

Published 2021-08-07. Last modified 2026-06-17.