ZDI-CAN-29287: ZDI-26-578: NGINX HTTP Dav Module Alias Directive Integer Underflow Remote Code Execution Vulnerability

Published Aug 13, 2026

Updated

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NGINX. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-27654.

Affected Software

1 affected component

Nginx nginx

Event History

Aug 13, 2026

Advisory Published

via ZDI·05:00 AM

Data Sourced

via ZDI·05:00 AM

Description

Frequently Asked Questions

What is the severity of ZDI-CAN-29287?

ZDI-CAN-29287 has been assigned a CVSS rating of 8.1, indicating a high severity risk.

How do I fix ZDI-CAN-29287?

To mitigate the risk of ZDI-CAN-29287, update your NGINX installation to the latest version that resolves this vulnerability.

What systems are affected by ZDI-CAN-29287?

ZDI-CAN-29287 affects installations of NGINX that utilize the HTTP Dav Module with the Alias Directive.

Can ZDI-CAN-29287 be exploited without authentication?

Yes, ZDI-CAN-29287 can be exploited by remote attackers without requiring authentication.

What type of attack does ZDI-CAN-29287 enable?

ZDI-CAN-29287 enables remote code execution attacks, allowing attackers to execute arbitrary code on the server.