Vulnerability · Published Sep 8, 2026 · Assigned by openjs
CVE-2026-75021fastify-cli vulnerable to remote code execution via ignored explicit Inspector bind address
High 8.1
In plain English
A high-severity security flaw in fastify-cli from fastify-cli. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official description
fastify-cli starts the Node.js Inspector when a debug flag is used, but it ignores the explicit bind address the user supplies and binds the Inspector to a broadly reachable address instead of the intended loopback. As a result the debugging interface can be exposed beyond the local machine, and because the Inspector protocol allows arbitrary code evaluation, a remote party that reaches it can achieve remote code execution on the developer's machine. This affects fastify-cli from 1.5.0 up to 8.0.1. Users should upgrade to fastify-cli 8.0.1, which honors the configured Inspector bind address.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| fastify-cli | fastify-cli | 1.5.0 – before 8.0.1 |
Weakness: CWE-1327 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H