CVE-2026-32647

A flaw was found in NGINX's ngx_http_mp4_module. This Out-of-Bounds Read/Write vulnerability occurs due to improper handling of specially crafted MP4 files. A local authenticated attacker, by supplying a malicious MP4 file, can trigger a buffer over-read or overwrite in worker memory. This can lead to process termination, potentially causing a denial-of-service or, under certain conditions, achieving code execution.

This IMPORTANT vulnerability in the NGINX ngx_http_mp4_module is due to improper handling of specially crafted MP4 files. A local authenticated attacker could exploit this flaw by providing a malicious MP4 file, leading to a denial of service or potentially arbitrary code execution. Red Hat products utilizing NGINX with the ngx_http_mp4_module enabled are affected if untrusted MP4 files are processed.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, disable the ngx_http_mp4_module in your NGINX configuration if MP4 file processing is not required. This can be done by commenting out or removing the mp4 directive from the NGINX configuration file. After modifying the configuration, a reload or restart of the NGINX service is required for the changes to take effect.

Alternatively, restrict access to the NGINX server to trusted networks and users to prevent the upload and processing of malicious MP4 files.