What’s Vulnerable › Vulnerabilities

CVE-2018-20991

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-08-26 · updated 2026-06-17
• Weakness: CWE-415

Description

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

How to fix

Upgrade to a fixed version: servo Smallvec 0.6.3. Check the vendor advisory for mitigations.

References

• https://rustsec.org/advisories/RUSTSEC-2018-0003.html
• https://rustsec.org/advisories/RUSTSEC-2018-0003.html

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