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.
- Score
- CVSS 3.0 3.3 Low
- Status
- Analyzed - support@hackerone.com
- Published
- 2026-03-30
- Last modified
- 2026-09-17
- Weaknesses
- CWE-732
Affected products
References
- https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
