CVE-2021-27378: Rand Core Project Rand Core

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.

Affected products

• Rand Core Project Rand Core: from 0.6.0, before 0.6.2 (fixed in 0.6.2)

Published 2021-02-18. Last modified 2026-06-17.