CVE-2019-11839: F5 Njs

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

njs through 0.3.1, used in NGINX, has a heap-based buffer overflow in Array.prototype.push after a resize, related to njs_array_prototype_push in njs/njs_array.c, because of njs_array_expand size mishandling.

Affected products

• F5 Njs: up to and including 0.3.1

Published 2019-05-09. Last modified 2026-06-17.