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TI-2026-52717 Aliases CVE-2026-75021

fastify-cli vulnerable to remote code execution via ignored explicit Inspector bind address

Priority LOW 38CWE-1327Published · Updated

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

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00705 53rd percentileScored 2026-11-07
Fix Fixed fastify-cli (fastify-cli): 8.0.1

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

VendorProductAffected versionsFixed inStatusSource
fastify-clifastify-cli1.5.0 to before 8.0.18.0.1Patch availableCNA
  • 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

  1. 2026-10-02 Threatist record created from CVE-2026-75021

References

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences