CVE-2019-12206: F5 Njs

Critical severity, CVSS 9.8. EPSS: 2% chance of exploitation in the next 30 days.

njs through 0.3.1, used in NGINX, has a heap-based buffer overflow in nxt_utf8_encode in nxt_utf8.c.

Affected products

• F5 Njs: up to and including 0.3.1

Published 2019-05-20. Last modified 2026-06-17.