CVE-2026-75021 json
fastify-cli vulnerable to remote code execution via ignored explicit Inspector bind address
published 2mo ago modified 2mo ago also EUVD-2026-72734 , GHSA-88v4-3ph7-r88m
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository fastify/fastify-cli. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm fastify-cli 8.0.1
- fastify-cli fastify-cli 8.0.1
Is CVE-2026-75021 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2mo ago
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | fastify-cli | >=1.5.0, <8.0.1 |
8.0.1 |
Affected products
- fastify-cli fastify-cli
Classification
- Weakness
-
- CWE-1327 Binding to an Unrestricted IP Address
References
Sources
- CVE List CVE-2026-75021
- NVD CVE-2026-75021
- Maintainer advisory GHSA-88v4-3ph7-r88m
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of fastify/fastify-cli published their own advisory on GitHub. Reviewed sources take precedence over it.