CVE-2026-27784

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.

How to fix CVE-2026-27784

To remediate CVE-2026-27784, upgrade the affected package to a fixed version below.

• —upgrade to 1.28.3-r0 or later
• —upgrade to 1.28.3 or later
• —upgrade to 1.28.3 or later
• —upgrade to 1.18.0-6.1+deb11u6 or later

Is CVE-2026-27784 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• from 0, < 1.28.3-r0
• >= 1.1.19, < 1.28.3, >= 1.29.0, < 1.29.7
• >= 1.1.19, < 1.28.3, >= 1.29.0, < 1.29.7
• from 0, < 1.18.0-6.1+deb11u6

CVSS scores

References (4)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2026-27784
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-27784
• WEBmy.f5.com/manage/s/article/K000160364
• WEBnvd.nist.gov/vuln/detail/CVE-2026-27784