CVE-2026-97205

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.

Score

CVSS 4.0 9.2 Critical

Status

Awaiting Analysis - f5sirt@f5.com

Published

2026-10-14

Last modified

2026-10-15

Weaknesses

CWE-416

Affected products

• Nginx Open Source (F5)
• Nginx Plus (F5)

References

• https://my.f5.com/manage/s/article/K000162608