CVE-2021-25900: Servo Smallvec

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

An issue was discovered in the smallvec crate before 0.6.14 and 1.x before 1.6.1 for Rust. There is a heap-based buffer overflow in SmallVec::insert_many.

Affected products

• Servo Smallvec: from 0.6.3, before 0.6.14 (fixed in 0.6.14); from 1.0.0, before 1.6.1 (fixed in 1.6.1)

Published 2021-01-26. Last modified 2026-06-17.