RCE in Jackwrichards Fastlymcp
CVE-2026-7220
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.021 (80.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.021 · change: +0.007
Affected products
- Jackwrichards Fastlymcp — versions 6f3d0b0e654fc51076badc7fa16c03c461f95620
Weakness classification (CWE)
References
- vuldb.com/vuln/359820 (technical-description, vdb-entry)
- vuldb.com/vuln/359820/cti (signature, permissions-required)
- vuldb.com/submit/802138 (third-party-advisory)
- github.com/jackwrichards/FastlyMCP/issues/3 (issue-tracking, exploit)
- github.com/jackwrichards/FastlyMCP/ (product)
Frequently asked questions
- What is CVE-2026-7220?
- CVE-2026-7220 is a high-severity vulnerability in Jackwrichards Fastlymcp, classified under Command Injection. CVSS score: 7.3/10. Published 2026-04-28.
- How severe is CVE-2026-7220?
- High severity. CVSS v3 base score is 7.3 out of 10.