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Remote Code Execution Vulnerability in NGINX

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

NGINX JavaScript module (njs) versions 0.9.4 to 0.9.8

Overview

A vulnerability has been reported in the JavaScript module (njs) of NGINX, which could allow an unauthenticated attacker to execute arbitrary code, trigger denial of service (DoS) condition or a heap buffer overflow on the targeted system.

Target Audience:

All end user organizations and individuals using NGINX

Risk Assessment: 

High risk of unauthorized access, system compromise.

Impact Assessment:

Potential for remote code execution, denial of service (DoS) condition, sensitive data exposure.

Description

NGINX is a high-performance web server, reverse proxy, load balancer and HTTP cache designed to handle massive, simultaneous connections with low resources usage. It acts as a fast, secure intermediary between clients and backend servers, serving static content, managing SSL/TLS encryption and distributing traffic to optimize speed.

A vulnerability exists in NGINX due to improper handling of client-controlled NGINX variables in the js_fetch_proxy directive when used with the ngx.fetch() operation in NGINX JavaScript. An attacker could exploit this by sending specially crafted HTTP requests.

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary code, trigger denial of service (DoS) condition or a heap buffer overflow on the targeted system.

Solution

Apply appropriate fix/patches as mentioned:

https://my.f5.com/manage/s/article/K000161307

Vendor Information

NGINX

https://my.f5.com/manage/s/article/K000161307

References

NGINX

https://my.f5.com/manage/s/article/K000161307

CVE Name

CVE-2026-8711

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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