# CVE-2026-19244: HKUDS nanobot MCP enabledTools Scope mcp.py connect_mcp_servers access control

> Attackers can bypass MCP enabledTools scope restrictions to access unauthorized resources or prompts in HKUDS nanobot.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Aug 2026
- **Updated:** 7 Aug 2026
- **Also known as:** GHSA-qwp6-wxvx-2jc8

## What is CVE-2026-19244?

CVE-2026-19244 is a medium-severity missing authorization vulnerability in HKUDS nanobot, published on 7 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability was detected in HKUDS nanobot up to 0.2.1. The affected element is the function connect_mcp_servers of the file nanobot/agent/tools/mcp.py of the component MCP enabledTools Scope Handler. Performing a manipulation results in improper access controls. The attack is possible to be carried out remotely. The exploit is now public and may be used. Upgrading to version 0.3.0 is sufficient to fix this issue. The patch is named 4436. You should upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: "Both reports describe the same root cause: MCP resource and prompt wrappers could be registered outside the intended enabledTools scope. The registration boundary was corrected".

Weakness: CWE-284 (Improper Access Control), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-19244?


## How do I fix CVE-2026-19244?

No fix has been published for CVE-2026-19244 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19244 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19244 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19244 and fix it if it is affected.

What it is: CVE-2026-19244 is a medium-severity missing authorization vulnerability in HKUDS nanobot, published on 7 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19244 exists.

Affected product: HKUDS nanobot. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-19244/ (Markdown: https://insights.sbomify.com/CVE-2026-19244/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19244
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19244
- OSV: https://osv.dev/vulnerability/CVE-2026-19244

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-19244/
Summaries are generated and may contain mistakes; the official description above is the record.