# 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.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Mar 2026
- **Updated:** 18 Mar 2026
- **Also known as:** GHSA-phqm-jgc3-qf8g, GO-2026-4724

## 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 (Improper Access Control)

## 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 | Ecosystem | 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: Kube-Router Kube-Router.

## How do I fix CVE-2026-32254?

Upgrade github.com/cloudnativelabs/kube-router/v2 to 2.8.0 or later.

## Is CVE-2026-32254 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-32254 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-32254 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-32254 exists.

Affected packages and fixed versions:
- github.com/cloudnativelabs/kube-router/v2 (Go): affected all versions; fixed in 2.8.0
- github.com/cloudnativelabs/kube-router/v2 (Go): affected all versions; fixed in 2.8.0
- github.com/cloudnativelabs/kube-router/v2 (Go): affected all versions; fixed in 2.8.0
- github.com/cloudnativelabs/kube-router (Go): affected all versions; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-32254/ (Markdown: https://insights.sbomify.com/CVE-2026-32254/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-32254
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-32254
- OSV: https://osv.dev/vulnerability/CVE-2026-32254

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-32254/
Summaries are generated and may contain mistakes; the official description above is the record.