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CVE-2026-27654

HIGH CVSS 4.0: 8.8 EPSS 0.03%
Updated Mar 26, 2026
F5
Parameter Value
CVSS 8.8 (HIGH)
Affected Versions 0.5.13 — 1.29.7
Fixed In 1.28.3
Type CWE-122 (Heap-based Buffer Overflow)
Vendor F5
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Vulnerable Products 19

Configuration From (including) Up to (excluding)
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r33:*:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r33:p3:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r34:*:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r34:p2:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r35:*:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r35:p1:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r36:*:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*
F5 Nginx_Plus
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:*:*:*:*
F5 Nginx_Open_Source
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
0.5.13 <= 0.9.7
F5 Nginx_Open_Source
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
1.0.0 1.28.3
F5 Nginx_Open_Source
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
1.29.0 1.29.7