CVE-2026-32254 Kube-router Proxy Module Blindly Trusts ExternalIPs/LoadBalancer IPs Enabling Cluster-Wide Traffic Hijacking and DNS DoS
Kube-router fails to validate external IPs, allowing attackers to hijack cluster traffic and cause DNS denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-32254?
CVE-2026-32254 is a high-severity missing authorization vulnerability in cloudnativelabs kube-router, published on 18 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kube-router is a turnkey solution for Kubernetes networking. Prior to version 2.8.0, Kube-router's proxy module does not validate externalIPs or loadBalancer IPs before programming them into the node's network configuration. Version 2.8.0 contains a patch for the issue. Available workarounds include enabling DenyServiceExternalIPs feature gate, deploying admission policy, restricting service creation RBAC, monitoring service changes, and applying BGP prefix filtering.
Weakness: CWE-284
Which versions are affected by CVE-2026-32254?
4 open source packages ship an affected version, including github.com/cloudnativelabs/kube-router/v2 and github.com/cloudnativelabs/kube-router. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cloudnativelabs/kube-router/v2 Go | All versions | 2.8.0 |
github.com/cloudnativelabs/kube-router/v2 Go | All versions | 2.8.0 |
github.com/cloudnativelabs/kube-router/v2 Go | All versions | 2.8.0 |
github.com/cloudnativelabs/kube-router Go | All versions | None |
Products include Kube-Router Kube-Router.
How do I fix CVE-2026-32254?
Upgrade github.com/cloudnativelabs/kube-router/v2 to 2.8.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-32254 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-32254 exists.
Sources
Also known as GHSA-phqm-jgc3-qf8g, GO-2026-4724.