SB2026040804 - Red Hat Enterprise Linux 9 update for the nginx:1.24 module
Published: April 8, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2026-32647)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error in the ngx_http_mp4_module module. A remote attacker can supply a specially crafted MP4 file to the server, trigger an out-of-bounds write and execute arbitrary code on the target system.
2) Heap-based buffer overflow (CVE-ID: CVE-2026-27654)
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to a boundary error in the ngx_http_dav_module module. A remote attacker can send specially crafted request to the server, trigger a heap-based buffer overflow and perform a denial of service attack or modify source or destination file names outside the document root.
3) Integer overflow (CVE-ID: CVE-2026-27784)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow in the ngx_http_mp4_module module. A remote attacker can supply specially crafted MP4 data to the server, trigger an integer overflow and execute arbitrary code on the target system.
Note, the vulnerability affects only 32-bit NGINX Open Source deployments.
4) NULL pointer dereference (CVE-ID: CVE-2026-27651)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the ngx_mail_auth_http_module module. A remote attacker can send specially crafted request to the server and perform a denial of service (DoS) attack.
Successful exploitation of the vulnerability requires that the CRAM-MD5 or APOP authentication is enabled, and the authentication server permits retry by returning the Auth-Wait response header.
Remediation
Install update from vendor's website.