fastify-cli vulnerable to remote code execution via ignored explicit Inspector bind address
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fastify-cli | fastify-cli | 1.5.0 to before 8.0.1 | 8.0.1 | Patch available | CNA |
- fastify-cli Vendorfastify-cli Affected 1.5.0 to before 8.0.1 Fixed in 8.0.1 Patch available CNA
Remediation
- Fix · CNA fastify-cli (fastify-cli) Fixed in 8.0.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-75021
References
Sources
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