Description (CNA)
A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync()` without the required read permission checks. This is an incomplete fix of CVE-2026-21715, which only covered `fs.realpathSync.native()`. As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| nodejs / node | affected 22.23.3 through 22.23.3; affected 24.22.0 through 24.22.0; affected 26.12.0 through 26.12.0 |
CWE
CWE-284