# CVE-2026-46519: MCP Server Kubernetes: Tool Access Control Bypass via Presentation-Layer Filtering Without Execution-Layer Enforcement

> Attackers can bypass Kubernetes operation restrictions in mcp-server-kubernetes by invoking tools directly, ignoring configured access controls.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 11 Jun 2026
- **Updated:** 11 Jun 2026
- **Also known as:** GHSA-cr22-wjx7-2w6m, openSUSE-SU-2026:10914-1, openSUSE-SU-2026:21152-1

## What is CVE-2026-46519?

CVE-2026-46519 is a high-severity missing authorization vulnerability in Flux159 mcp-server-kubernetes, published on 11 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

mcp-server-kubernetes is a Model Context Protocol server for Kubernetes cluster management. Prior to version 3.6.0, mcp-server-kubernetes exposes three environment variables (ALLOW_ONLY_READONLY_TOOLS, ALLOW_ONLY_NON_DESTRUCTIVE_TOOLS, ALLOWED_TOOLS) documented as access controls for restricting which Kubernetes operations are available. These controls are enforced at the tool discovery layer (tools/list) but not at the execution layer (tools/call). Any client that knows a tool name can invoke it directly regardless of the configured restriction mode. The access control was effectively cosmetic. This issue has been patched in version 3.6.0.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-46519?

2 open source packages ship an affected version, including mcp-server-kubernetes.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mcp-server-kubernetes` | npm | All versions | 3.6.0 |
| `mcp-server-kubernetes` | npm | All versions | 3.6.0 |
| `atril` | openSUSE:Leap 16.0 | All versions | 1.28.4-bp160.1.1 |
| `atril` | openSUSE:Tumbleweed | All versions | 1.28.4-1.1 |

## How do I fix CVE-2026-46519?

Upgrade mcp-server-kubernetes to 3.6.0 or later.

## Is CVE-2026-46519 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46519 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46519 and fix it if it is affected.

What it is: CVE-2026-46519 is a high-severity missing authorization vulnerability in Flux159 mcp-server-kubernetes, published on 11 Jun 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-2026-46519 exists.

Affected packages and fixed versions:
- mcp-server-kubernetes (npm): affected all versions; fixed in 3.6.0
- mcp-server-kubernetes (npm): affected all versions; fixed in 3.6.0

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-2026-46519/ (Markdown: https://insights.sbomify.com/CVE-2026-46519/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46519
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46519
- OSV: https://osv.dev/vulnerability/CVE-2026-46519

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46519/
Summaries are generated and may contain mistakes; the official description above is the record.