#VU124548 Improper Access Control in Node.js - CVE-2026-21715
Published: March 25, 2026
Vulnerability identifier: #VU124548
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21715
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 disclose file existence and resolve symlinks.
The vulnerability exists due to improper access control in fs.realpathSync.native() within the Node.js Permission Model when accessing filesystem paths. A local user can run code under --permission with restricted --allow-fs-read to use fs.realpathSync.native() and determine file existence, resolve symlink targets, and enumerate paths outside permitted directories.
This bypass affects only environments using the Permission Model with intentionally restricted filesystem read permissions.
Remediation
Install security update from vendor's website.