---
id: CVE-2026-21716
title: >-
  An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and
  `FileHandle.chown()` in the promises API without the required permission
  checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`)
  were correctly pa…
summary: >-
  An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and
  `FileHandle.chown()` in the promises API without the required permission
  checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`)
  were correctly pa…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-862
vendor: nodejs
product: node.js
affected:
  - node.js <= 20.20.1
  - 'node.js >= 22.0.0, <= 22.22.1'
  - 'node.js >= 24.0.0, <= 24.14.0'
  - 'node.js >= 25.0.0, <= 25.8.1'
published: '2026-03-30'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21716'
references:
  - url: 'https://nodejs.org/en/blog/vulnerability/march-2026-security-releases'
    label: support@hackerone.com
tags:
  - nvd
epss: 0.00149
epssPercentile: 0.03392
ingestedAt: '2026-08-19T13:39:32.895Z'
---

## Overview

An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`) were correctly patched.

As a result, code running under `--permission` with restricted `--allow-fs-write` can still use promise-based `FileHandle` methods to modify file permissions and ownership on already-open file descriptors, bypassing the intended write restrictions.

This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted.

## Affected

- `node.js <= 20.20.1`
- `node.js >= 22.0.0, <= 22.22.1`
- `node.js >= 24.0.0, <= 24.14.0`
- `node.js >= 25.0.0, <= 25.8.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.