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CVE-2026-27784— NGINX ngx_http_mp4_module vulnerability

Quick assessment

Affected
F5 NGINX Open Source
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F5 NGINX Open Source是美国F5公司的一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Open Source 32位版本存在输入验证错误漏洞，该漏洞源于ngx_http_mp4_module模块存在越界读取或写入问题，可能导致使用特制MP4文件时终止工作进程。

CVSS 7.8 · High EPSS 1.08% · P64

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.29.0< 1.29.7 affected
1.1.19< 1.28.3 affected
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I. Basic Information for CVE-2026-27784

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_mp4_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Open Source 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 NGINX Open Source是美国F5公司的一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Open Source 32位版本存在输入验证错误漏洞，该漏洞源于ngx_http_mp4_module模块存在越界读取或写入问题，可能导致使用特制MP4文件时终止工作进程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX Open Source 1.29.0 ~ 1.29.7 -

II. Public POCs for CVE-2026-27784

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III. Intelligence Information for CVE-2026-27784

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Vendor Advisories for CVE-2026-27784 (1)

Same Patch Batch · F5 · 2026-03-24 · 6 CVEs total

CVE-2026-27654 8.2 HIGH NGINX ngx_http_dav_module vulnerability
CVE-2026-32647 7.8 HIGH NGINX ngx_http_mp4_module vulnerability
CVE-2026-27651 7.5 HIGH NGINX ngx_mail_auth_http_module vulnerability
CVE-2026-28755 5.4 MEDIUM NGINX ngx_stream_ssl_module vulnerability
CVE-2026-28753 3.7 LOW NGINX ngx_mail_proxy_module vulnerability

IV. Related Vulnerabilities

Same product: NGINX Open Source
Same vendor: F5
Same weakness: CWE-190

V. Comments for CVE-2026-27784

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