#VU126391 Improper access control in Node.js - CVE-2026-21636
Published: April 17, 2026
Vulnerability identifier: #VU126391
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21636
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Node.js
Node.js
Software vendor:
Node.js Foundation
Node.js Foundation
Description
The vulnerability allows a local user to access privileged local services.
The vulnerability exists due to improper access control in the permission model when handling Unix Domain Socket connections without network permission checks. A local user can supply a crafted URL or socketPath to access privileged local services.
The issue affects net, tls, and undici/fetch when the permission model is enabled, and network permissions were experimental at the time.
Remediation
Install security update from vendor's website.