CVE-2026-27784 NGINX ngx_http_mp4_module vulnerability
An attacker can cause a denial of service in 32-bit NGINX servers by sending a crafted MP4 file to the mp4 module.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27784?
CVE-2026-27784 is a high-severity vulnerability in F5 NGINX Open Source, published on 24 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The 32-bit implementation of NGINX Open Source has a vulnerability in the ngx_http_mp4_module module, which might allow an attacker to over-read or over-write NGINX worker memory resulting in its termination, using a specially crafted MP4 file. The issue only affects 32-bit NGINX Open Source if it is built with the ngx_http_mp4_module module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted MP4 file with the ngx_http_mp4_module module.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness: CWE-190
Which versions are affected by CVE-2026-27784?
2 open source packages ship an affected version, including nginx and nginx-gateway. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nginx Bitnami | From 1.1.19 | 1.28.3, 1.29.7 |
nginx-gateway Bitnami | From 1.1.19 | 1.28.3, 1.29.7 |
Products include F5 Nginx Open Source.
How do I fix CVE-2026-27784?
Upgrade nginx to a fixed version for your release line: 1.28.3 or 1.29.7.
Is CVE-2026-27784 being exploited?
There is no known exploitation of CVE-2026-27784 in the wild and no public exploit code.
Other vulnerabilities in F5 NGINX Open Source
Sources
Also known as ALPINE-CVE-2026-27784, AZL-80777, BELL-CVE-2026-27784, BIT-nginx-2026-27784, BIT-nginx-gateway-2026-27784, CLSA-2026-1776683513 and 9 more.