What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-18 · updated 2026-06-17
• Weakness: CWE-284

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 products

• cloudnativelabs kube-router: before 2.8.0 — fixed in 2.8.0

How to fix

Upgrade to a fixed version: cloudnativelabs kube-router 2.8.0. Check the vendor advisory for mitigations.

References

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

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