Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M

CVE-2026-32254Kube-router Proxy Module Blindly Trusts ExternalIPs/LoadBalancer IPs Enabling Cluster-Wide Traffic Hijacking and DNS DoS

High 7.1

In plain English

A high-severity improper access control in kube-router from cloudnativelabs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.3%top 75.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/cloudnativelabs/kube-router	no fix listed	GO-2026-4724
Go	github.com/cloudnativelabs/kube-router/v2	2.8.0	GHSA-phqm-jgc3-qf8g
Go	github.com/cloudnativelabs/kube-router/v2	2.8.0	GO-2026-4724

Affected products (as reported)

Vendor	Product	Versions
cloudnativelabs	kube-router	< 2.8.0

Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

References

https://github.com/cloudnativelabs/kube-router/security/advisories/GHSA-phqm-jgc3-qf8g x_refsource_CONFIRM
https://github.com/cloudnativelabs/kube-router/commit/a1f0b2eea3ee0f66b9a5b5c49dcb714619ccd456 x_refsource_MISC
https://github.com/cloudnativelabs/kube-router/releases/tag/v2.8.0 x_refsource_MISC