CVE-2026-21715: 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.
Overview
- Severity
- Low (CVSS 3.3)
- CVSS Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Mar
- Released
- 2026-04-01
- Last Updated
- 2026-04-09
- EPSS Score
- 0.16% (percentile: 5.4%)
Affected Products (2)
Other
Open Source Software
- azl3 nodejs24 24.13.0-3 on Azure Linux 3.0
Revision History
- 2026-04-01: Information published.
- 2026-04-08: Information published.
- 2026-04-09: Information published.