CVE-2026-21715
Published: March 26, 2026Last modified: March 28, 2026
Description
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 3.3 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | NONE |
| Availability impact | NONE |
| Vector | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | nodejs | Fixed (20.20.2-r0) |
| 25 LTS | nodejs | Fixed (22.22.2-r0) | |
| Stream | nodejs | Fixed (24.14.1-r0) | |
| Hardened Containers | 23 LTS | nodejs | Fixed (20.20.2-r0) |
| 25 LTS | nodejs | Fixed (22.22.2-r0) | |
| Stream | nodejs | Fixed (24.14.1-r0) |