# CVE-2026-59726: Ruflo: Unauthenticated RCE in MCP bridge default docker-compose deployment

> Unauthenticated attackers can execute arbitrary commands and read API keys via exposed MCP bridge endpoints in Ruflo's default Docker deployment.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jul 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-c4hm-4h84-2cf3

## What is CVE-2026-59726?

CVE-2026-59726 is a critical command injection vulnerability in ruvnet ruflo, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Ruflo is an agent meta-harness for Claude Code and Codex. Prior to 3.16.3, ruflo's default docker-compose deployment exposed the MCP bridge POST /mcp and POST /mcp/:group endpoints without authentication, allowing an unauthenticated network attacker to invoke tools/call to terminal_execute, obtain a shell in the bridge container, read provider API keys, and poison AgentDB learning-store patterns. This issue is fixed in version 3.16.3.

Weakness: CWE-942 (Permissive Cross-domain Security Policy with Untrusted Domains), CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-59726?


## How do I fix CVE-2026-59726?

No fix has been published for CVE-2026-59726 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-59726 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59726 exists.

Public exploit code:

- CVE-2026-59726 - Draft or Todo (github_poc): https://github.com/HORKimhab/CVE-2026-59726
- ruflo MCP Bridge - Unauthenticated RCE via terminal_execute (nuclei): http/cves/2026/CVE-2026-59726.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-59726 and fix it if it is affected.

What it is: CVE-2026-59726 is a critical command injection vulnerability in ruvnet ruflo, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59726 exists.

Affected product: ruvnet ruflo. 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-2026-59726/ (Markdown: https://insights.sbomify.com/CVE-2026-59726/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59726
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59726
- OSV: https://osv.dev/vulnerability/CVE-2026-59726

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-59726/
Summaries are generated and may contain mistakes; the official description above is the record.