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.
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 3.0 | 3.3 | LOW | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Version: 3.0
Base score: 3.3
Base severity: LOW
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N