CVE-2026-21715

Low

Low Medium High Critical

CVSS Score

Published: Mar 30, 2026

Last Modified: Apr 01, 2026

Vulnerability Description

A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce them.

As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync.native()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories.

This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-read` is intentionally restricted.

Available Security Patches

1 patch available from vendors

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SUSE

CVE-2026-21715

Severity

Unknown

Released

Apr 16, 2026

Security Update

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References & Resources

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
support@hackerone.com

Severity Details

out of 10.0

Low

Weakness Type (CWE)

CWE-732

Incorrect Permission Assignment for Critical Resource

Description: The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
Exploit Likelihood: High
Typical Severity: High
Abstraction Level: Class