# CVE-2026-7220: jackwrichards FastlyMCP fastly_cli Tool fastly-mcp.mjs os command injection

> Remote attackers can execute arbitrary OS commands via the command argument in the FastlyMCP tool, requiring immediate attention from users of this developer utility.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Apr 2026
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-q854-929v-gwpx

## What is CVE-2026-7220?

CVE-2026-7220 is a medium-severity command injection vulnerability in jackwrichards FastlyMCP, published on 28 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in jackwrichards FastlyMCP up to 6f3d0b0e654fc51076badc7fa16c03c461f95620. This impacts an unknown function of the file fastly-mcp.mjs of the component fastly_cli Tool. The manipulation of the argument command leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. This product is using a rolling release to provide continious delivery. Therefore, no version details for affected nor updated releases are available. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-7220?


## How do I fix CVE-2026-7220?

No fix has been published for CVE-2026-7220 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7220 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7220 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7220 and fix it if it is affected.

What it is: CVE-2026-7220 is a medium-severity command injection vulnerability in jackwrichards FastlyMCP, published on 28 Apr 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-2026-7220 exists.

Affected product: jackwrichards FastlyMCP. 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-2026-7220/ (Markdown: https://insights.sbomify.com/CVE-2026-7220/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7220
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7220
- OSV: https://osv.dev/vulnerability/CVE-2026-7220

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7220/
Summaries are generated and may contain mistakes; the official description above is the record.