CVE-2019-16141: Once Cell Project Once Cell

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

An issue was discovered in the once_cell crate before 1.0.1 for Rust. There is a panic during initialization of Lazy.

Affected products

• Once Cell Project Once Cell: from 0.2.6, before 1.0.1 (fixed in 1.0.1)

Published 2019-09-09. Last modified 2026-06-17.