CVE-2016-5255: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 2.4% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the js::PreliminaryObjectArray::sweep function in Mozilla Firefox before 48.0 allows remote attackers to execute arbitrary code via crafted JavaScript that is mishandled during incremental garbage collection.

Affected products

• Mozilla Firefox: up to and including 47.0.1

Published 2016-08-05. Last modified 2026-06-17.