CVE-2026-21715: Node.js

Low severity, CVSS 3.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Node.js Node.js: up to and including 20.20.1; from 22.0.0, up to and including 22.22.1; from 24.0.0, up to and including 24.14.0; from 25.0.0, up to and including 25.8.1

Published 2026-03-30. Last modified 2026-08-19.