CVE-2026-40460: F5 Dos

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• F5 Dos: from 4.3.0, up to and including 4.7.0; version 4.8.0 only
• F5 Nginx Gateway Fabric: from 1.3.0, up to and including 1.6.2; from 2.0.0, up to and including 2.6.0
• F5 Nginx Ingress Controller: from 3.5.0, up to and including 3.7.2; from 4.0.0, up to and including 4.0.1; from 5.0.0, up to and including 5.4.2
• F5 Nginx Instance Manager: from 2.16.0, up to and including 2.22.0
• F5 Nginx Open Source: from 1.25.0, up to and including 1.30.0
• F5 Nginx Plus: from r32, up to and including r36
• F5 Waf: from 4.9.0, up to and including 4.16.0; from 5.1.0, up to and including 5.8.0; from 5.9.0, up to and including 5.12.1

Published 2026-05-13. Last modified 2026-06-29.