CVE-2018-20991: Servo Smallvec

Critical severity, CVSS 9.8. EPSS: 1.8% chance of exploitation in the next 30 days.

An issue was discovered in the smallvec crate before 0.6.3 for Rust. The Iterator implementation mishandles destructors, leading to a double free.

Affected products

• Servo Smallvec: from 0.3.2, before 0.6.3 (fixed in 0.6.3)

Published 2019-08-26. Last modified 2026-06-17.