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CVE-2026-27654— NGINX ngx_http_dav_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 Plus和F5 NGINX Open Source都是美国F5公司的产品。F5 NGINX Plus是一个基于软件的应用程序交付平台。F5 NGINX Open Source是一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Plus和F5 NGINX Open Source存在安全漏洞，该漏洞源于ngx_http_dav_module模块存在缓冲区溢出，可能导致工作进程终止或修改文档根目录之外的文件名。

CVSS 8.2 · High EPSS 1.52% · P74

Affected Version Matrix 7

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.29.0< 1.29.7 affected
0.5.13< 1.28.3 affected
F5 NGINX Plus R36< R36 P3 affected
R35< R35 P2 affected
R34< * affected
R33< * affected
R32< R32 P5 affected
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I. Basic Information for CVE-2026-27654

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_dav_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_dav_module module that might allow an attacker to trigger a buffer overflow to the NGINX worker process; this vulnerability may result in termination of the NGINX worker process or modification of source or destination file names outside the document root. This issue affects NGINX Open Source and NGINX Plus when the configuration file uses DAV module MOVE or COPY methods, prefix location (nonregular expression location configuration), and alias directives. The integrity impact is constrained because the NGINX worker process user has low privileges and does not have access to the entire system. 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:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Plus和F5 NGINX Open Source 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 NGINX Plus和F5 NGINX Open Source都是美国F5公司的产品。F5 NGINX Plus是一个基于软件的应用程序交付平台。F5 NGINX Open Source是一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Plus和F5 NGINX Open Source存在安全漏洞，该漏洞源于ngx_http_dav_module模块存在缓冲区溢出，可能导致工作进程终止或修改文档根目录之外的文件名。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX Open Source 1.29.0 ~ 1.29.7 -
F5 NGINX Plus R36 ~ R36 P3 -

II. Public POCs for CVE-2026-27654

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III. Intelligence Information for CVE-2026-27654

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Vendor Advisories for CVE-2026-27654 (1)

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

CVE-2026-27784 7.8 HIGH NGINX ngx_http_mp4_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-122

V. Comments for CVE-2026-27654

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