NGINX HTTP/3 QUIC IP Spoofing for Auth / Rate Limiting Bypass
CVE-2026-40460 Published on May 13, 2026

NGINX ngx_quic_module vulnerability
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-40460 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity, and a small impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
NONE
Availability Impact:
LOW

Weakness Type

Authentication Bypass by Spoofing

This attack-focused weakness is caused by improperly implemented authentication schemes that are subject to spoofing attacks.


Products Associated with CVE-2026-40460

stack.watch emails you whenever new vulnerabilities are published in F5 Networks Nginx Plus or F5 Networks Nginx Open Source. Just hit a watch button to start following.

F5 Networks Nginx Plus
 
F5 Networks Nginx Open Source
 

Affected Versions

F5 NGINX Plus: F5 NGINX Open Source: