Improper Access Control in Node.js - CVE-2026-21716

Vulnerability identifier: #VU124549

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-21716

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to modify file permissions and ownership.

The vulnerability exists due to improper access control in FileHandle.chmod() and FileHandle.chown() methods in the promises API when modifying file metadata. A local user can run code under --permission with restricted --allow-fs-write to use promise-based FileHandle methods and change permissions or ownership of already-open file descriptors, bypassing intended write restrictions.

This issue affects only environments using the Permission Model with --allow-fs-write intentionally restricted.

Note, the vulnerability exists due to incomplete fix for #VU93881 (CVE-2024-36137).

Node.js
Debian Linux
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Web and Scripting Module
openSUSE Leap
Anolis OS
openEuler
Fedora
IBM Business Automation Workflow
npm
nodejs-npm
v8-devel
v8-12.4-devel
nodejs
nodejs-debuginfo
nodejs-debugsource
nodejs-devel
nodejs-full-i18n
nodejs-libs
nodejs-docs
nodejs (Debian package)
nodejs20
npm20
nodejs20-debuginfo
nodejs20-devel
corepack20
nodejs20-debugsource
nodejs20-docs
nodejs22
nodejs22-docs
nodejs22-debuginfo
nodejs22-devel
corepack22
nodejs22-debugsource
npm22
nodejs24 (Red Hat package)
nodejs24-devel
npm24
nodejs24-debuginfo
nodejs24
nodejs24-debugsource
nodejs24-docs

Install security update from vendor's website.

Node.js - addressed in versions 20.20.2, 22.22.2, 24.14.1, 25.8.2
IBM Business Automation Workflow - addressed in versions 24.0.0-IF009, 24.0.1-IF008, 25.0.0-IF005, 26.0.0.0
npm - update to 10.8.2-1.20.18.2.7
nodejs-npm - update to 10.9.4-1.22.22.0.5
v8-devel - update to 11.3.244.8-1.20.18.2.7
v8-12.4-devel - update to 12.4.254.21-1.22.22.0.5
nodejs - update to 20.18.2-7
nodejs-debuginfo - update to 20.18.2-7
nodejs-debugsource - update to 20.18.2-7
nodejs-devel - update to 20.18.2-7
nodejs-full-i18n - update to 20.18.2-7
nodejs-libs - update to 20.18.2-7
nodejs-docs - update to 20.18.2-7
nodejs (Debian package) - update to 20.19.2+dfsg-1+deb13u2
nodejs20 - addressed in versions 20.20.2-3.fc43, 20.20.2-3.fc44, 20.20.2-4.fc42
npm20 - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
nodejs20-debuginfo - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
nodejs20-devel - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
corepack20 - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
nodejs20 - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
nodejs20-debugsource - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
nodejs20-docs - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
nodejs-docs - update to 22.22.0-5
nodejs-libs - update to 22.22.0-5
nodejs-full-i18n - update to 22.22.0-5
nodejs-devel - update to 22.22.0-5
nodejs - update to 22.22.0-5
nodejs22 - addressed in versions 22.22.2-2.fc43, 22.22.2-3.fc42, 22.22.2-3.fc44
nodejs22 - addressed in versions 22.22.2-150600.13.15.1, 22.22.2-150700.3.9.1
nodejs22-docs - addressed in versions 22.22.2-150600.13.15.1, 22.22.2-150700.3.9.1
nodejs22-debuginfo - addressed in versions 22.22.2-150600.13.15.1, 22.22.2-150700.3.9.1
nodejs22-devel - addressed in versions 22.22.2-150600.13.15.1, 22.22.2-150700.3.9.1
corepack22 - update to 22.22.2-150600.13.15.1
nodejs22-debugsource - addressed in versions 22.22.2-150600.13.15.1, 22.22.2-150700.3.9.1
npm22 - addressed in versions 22.22.2-150600.13.15.1, 22.22.2-150700.3.9.1
nodejs24 (Red Hat package) - update to 24.14.1-2.el10_1
nodejs24-devel - update to 24.14.1-150700.15.8.1
npm24 - update to 24.14.1-150700.15.8.1
nodejs24-debuginfo - update to 24.14.1-150700.15.8.1
nodejs24 - update to 24.14.1-150700.15.8.1
nodejs24-debugsource - update to 24.14.1-150700.15.8.1
nodejs24-docs - update to 24.14.1-150700.15.8.1

• https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

• Multiple vulnerabilities in Node.js
• Debian update for nodejs
• SUSE update for nodejs20
• SUSE update for nodejs20
• SUSE update for nodejs24
• openEuler 24.03 LTS SP1 update for nodejs
• openEuler 24.03 LTS update for nodejs
• openEuler 24.03 LTS SP3 update for nodejs
• openEuler 24.03 LTS SP2 update for nodejs
• SUSE update for nodejs22
• SUSE update for nodejs22
• Fedora 44 update for nodejs20
• Anolis OS update for nodejs
• Fedora 43 update for nodejs20
• Red Hat Enterprise Linux 9 update for the nodejs:24 module
• Red Hat Enterprise Linux 10 update for nodejs24
• Fedora 44 update for nodejs22
• Fedora 43 update for nodejs22
• Fedora 42 update for nodejs20
• Fedora 42 update for nodejs22
• Multiple vulnerabilities in IBM Business Automation Workflow