CVE-2026-40460

MEDIUM

NGINX Plus and Open Source - Authentication Bypass via HTTP/3 QUIC Module

Title source: llm
STIX 2.1

Description

When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
https://my.f5.com/manage/s/article/K000161068

Scores

CVSS v3 6.5
EPSS 0.0037
EPSS Percentile 28.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-290
Status published
Products (13)
f5/dos 4.8.0
f5/dos 4.3.0 - 4.7.0
F5/NGINX Open Source 1.26.0 - 1.30.1
F5/NGINX Open Source 1.31.0
F5/NGINX Plus R32 - R32 P6
F5/NGINX Plus R36 - R36 P4
F5/NGINX Plus R37
f5/nginx_gateway_fabric 1.3.0 - 1.6.2
f5/nginx_ingress_controller 3.5.0 - 3.7.2
f5/nginx_instance_manager 2.16.0 - 2.22.0
... and 3 more
Published May 13, 2026
Tracked Since May 13, 2026