Improper Access Control in Node.js - CVE-2026-21715

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Main Vulnerability Database Vulnerabilities #VU124548

Improper Access Control in Node.js - CVE-2026-21715

Published: March 25, 2026


Vulnerability identifier: #VU124548
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-21715
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to disclose file existence and resolve symlinks.

The vulnerability exists due to improper access control in fs.realpathSync.native() within the Node.js Permission Model when accessing filesystem paths. A local user can run code under --permission with restricted --allow-fs-read to use fs.realpathSync.native() and determine file existence, resolve symlink targets, and enumerate paths outside permitted directories.

This bypass affects only environments using the Permission Model with intentionally restricted filesystem read permissions.


Affected software

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

How to mitigate CVE-2026-21715

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 10.9.4-1.22.22.0.4
v8-devel - update to 11.3.244.8-1.20.18.2.7
v8-12.4-devel - update to 12.4.254.21-1.22.22.0.4
nodejs-devel - update to 20.18.2-7
nodejs-debugsource - update to 20.18.2-7
nodejs-debuginfo - update to 20.18.2-7
nodejs - update to 20.18.2-7
nodejs-docs - update to 20.18.2-7
nodejs-libs - update to 20.18.2-7
nodejs-full-i18n - 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
nodejs20-debugsource - 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
corepack20 - 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
nodejs20-debuginfo - addressed in versions 20.20.2-150500.11.27.1, 20.20.2-150600.3.18.1
npm20 - 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 - update to 22.22.0-4
nodejs-full-i18n - update to 22.22.0-4
nodejs-devel - update to 22.22.0-4
nodejs-docs - update to 22.22.0-4
nodejs-libs - update to 22.22.0-4
nodejs22 - addressed in versions 22.22.2-2.fc43, 22.22.2-3.fc42, 22.22.2-3.fc44
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 - 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
nodejs22-debugsource - 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

External References

Related Security Bulletins