CVE-2026-40460
6.5 · MEDIUMWhen 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 li…
Overview
CVE-2026-40460 is a medium-severity vulnerability affecting f5 dos. It was published on May 13, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from f5. Update dos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| f5 | dos | 4.3.0 | Affected |
| f5 | nginx_gateway_fabric | 1.3.0 | Affected |
| f5 | nginx_ingress_controller | 3.5.0 | Affected |
| f5 | nginx_instance_manager | 2.16.0 | Affected |
| f5 | nginx_open_source | 1.25.0 | Affected |
| f5 | nginx_plus | r32 | Affected |
| f5 | waf | 4.9.0 | Affected |
References
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Frequently asked questions
What is CVE-2026-40460?
CVE-2026-40460 is a medium-severity vulnerability affecting f5 dos. It was published on May 13, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2026-40460?
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-40460?
Check the references section for vendor advisories and patches from f5. Update dos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-40460?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40460 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.
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