# CVE-2026-32682: F5 NGINX Gateway Fabric DoS in GRPCRoute backendRef filters

Source: https://junglewise.ai/threats/cve-2026-32682-f5-nginx-gateway-fabric-dos-in-grpcroute-backendref-filters  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-17. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-32682 · Severity: medium · CVSS 6.5 · Published 2026-06-17

F5 NGINX Gateway Fabric, a tool used to manage network traffic for modern applications, contains a vulnerability that can cause its control system to crash. An authorized user with the ability to configure traffic routing can send a specifically crafted request that forces the system to shut down. This results in a denial-of-service condition, potentially disrupting the management of network traffic and application availability.

Technologies: [F5 Nginx Gateway Fabric](https://junglewise.ai/threats/technologies/nginx-gateway-fabric). Vendors: [F5](https://junglewise.ai/threats/vendors/f5).

## Quick answers

**Is CVE-2026-32682 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-32682 being exploited in the wild.

**How severe is CVE-2026-32682?** Medium severity, with a CVSS score of 6.5, published 17 June 2026.

**Which products and versions are affected?** F5 Nginx Gateway Fabric 1.3.0 to 2.6.3.

**Is there a fix for CVE-2026-32682?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-32682 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-32682?** Check whether you run F5 Nginx Gateway Fabric at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A denial-of-service vulnerability exists in NGINX Gateway Fabric when configured with GRPCRoutes. The issue is caused by improper validation of array indexes (CWE-129) within the control plane when processing GRPCRoute configurations that contain backendRef filters. An authenticated remote attacker with the necessary Kubernetes RBAC permissions to create or modify GRPCRoute resources can submit a crafted configuration that triggers a process termination. This affects versions 1.3.0 through 2.6.3; users should update to version 2.6.4 or later to resolve the issue.

## Affected products

- F5 NGINX Gateway Fabric 1.3.0 to 2.6.3

## Timeline

- 2026-06-17: disclosed
- 2026-06-17: advisory

## References

- [https://my.f5.com/manage/s/article/K000161786](https://my.f5.com/manage/s/article/K000161786)

## Related threats

- [F5 NGINX Gateway Fabric configuration injection in NginxProxy CRD](https://junglewise.ai/threats/cve-2026-50107-f5-nginx-gateway-fabric-configuration-injection-in-nginxproxy-crd)
- [F5 NGINX Gateway Fabric configuration injection in CRD fields](https://junglewise.ai/threats/cve-2026-11311-f5-nginx-gateway-fabric-configuration-injection-in-crd-fields)
- [F5 NGINX memory over-read in SCGI and uWSGI modules](https://junglewise.ai/threats/cve-2026-42946-f5-nginx-memory-over-read-in-scgi-and-uwsgi-modules)
- [F5 NGINX heap buffer over-read in ngx_http_charset_module](https://junglewise.ai/threats/cve-2026-42934-f5-nginx-heap-buffer-over-read-in-ngx-http-charset-module)
- [F5 NGINX Open Source header injection in HTTP/2 proxying](https://junglewise.ai/threats/cve-2026-42926-f5-nginx-open-source-header-injection-in-http-2-proxying)