CVE-2026-27654 — NGINX ngx_http_dav_module vulnerability

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
F5 / NGINX Open Source	affected 1.29.0 before 1.29.7; affected 0.5.13 before 1.28.3
F5 / NGINX Plus	affected R36 before R36 P3; affected R35 before R35 P2; affected R34 before ; affected R33 before ; affected R32 before R32 P5

CWE

CWE-122

References

https://my.f5.com/manage/s/article/K000160382

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in NGINX. A remote attacker can exploit a buffer overflow vulnerability within the ngx_http_dav_module module. This occurs when the NGINX configuration uses DAV module MOVE or COPY methods in conjunction with prefix location and alias directives. Successful exploitation may lead to the termination of the NGINX worker process, resulting in a Denial of Service (DoS), or allow for the modification of source or destination file names outside the intended document root.