CVE-2026-97205: F5 Nginx Open Source

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_core_module module. When asynchronous file I/O (AIO) is enabled in certain configurations, processing a Server Side Includes (SSI) page containing “include virtual” commands may trigger a Use-After-Free (UAF) in the NGINX worker process. This may cause memory corruption or a worker process crash. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system, corrupt its memory, or possibly trigger code execution. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 Nginx Open Source: from 1.31.0, before 1.31.7 (fixed in 1.31.7); from 1.30.0, before 1.30.6 (fixed in 1.30.6)
• F5 Nginx Plus: from 37.1.0, before 37.1.0.1 (fixed in 37.1.0.1); from 37.0.0, before 37.0.5.1 (fixed in 37.0.5.1); from R36; from R35; from R34; from R33

Published 2026-10-14. Last modified 2026-10-15.