CVE-2026-75021
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 35% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1327 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-47176 | Medium | 5.3 | 51% | - | Fix |
| CVE-2023-1968 | Critical | 10.0 | 1.8% | - | - |
| CVE-2025-3621 | Critical | 9.6 | 0.8% | - | - |
| CVE-2024-36105 | Medium | 5.3 | 0.7% | - | Fix |
| CVE-2025-61934 | Critical | 10.0 | 0.6% | - | - |
| CVE-2026-24015 | Critical | 9.8 | 0.6% | - | Fix |
Common questions
How do I fix CVE-2026-75021?
No published fix for CVE-2026-75021 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-75021 being actively exploited?
Not that we know of. CVE-2026-75021 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.42% is the estimated probability that it will be exploited in the next 30 days. That is higher than 35% of all scored CVEs.
How severe is CVE-2026-75021?
CVE-2026-75021 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-08.