---
id: CVE-2026-106073
title: >-
  nodejs: Node.js: Filesystem read permission bypass via fs.realpathSync()
  (CVE-2026-106073)
summary: >-
  A flaw was found in the Node.js Permission Model. fs.realpathSync() does not
  perform the filesystem read permission checks required of comparable fs APIs.
  This is an incomplete fix of CVE-2026-21715, which only covered
  fs.realpathSync.nati…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cvssSource: vendor
cwe:
  - CWE-425
  - CWE-284
vendor: Red Hat
product: Red Hat Enterprise Linux 8
affected:
  - enterprise_linux 10
  - enterprise_linux 8
  - enterprise_linux 9
published: '2026-10-23'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T11:05:40+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106073.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106073.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-106073'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2560021'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-106073'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106073'
  - url: 'https://nodejs.org/en/blog/vulnerability/october-2026-security-releases'
tags:
  - csaf
  - vex
  - red-hat
  - exploit-available
  - cve.org
epss: 0.00245
epssPercentile: 0.15651
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/CompleTetech-Security/node-cve-2026-106073-check'
  checkedAt: '2026-10-27T16:54:45.987Z'
exploitAvailable: true
ingestedAt: '2026-10-23T16:31:11.320Z'
---

## Overview

A flaw was found in the Node.js Permission Model. fs.realpathSync() does not perform the filesystem read permission checks required of comparable fs APIs. This is an incomplete fix of CVE-2026-21715, which only covered fs.realpathSync.native(). Code running under --permission with restricted --allow-fs-read can still use fs.realpathSync() to probe file existence, resolve symlink targets, and enumerate paths outside permitted directories, leading to information disclosure.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106073.json)

**nodejs: Node.js: Filesystem read permission bypass via fs.realpathSync()** — rated Low by Red Hat. Released 2026-10-23, updated 2026-10-26.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9

Not affected:

- Red Hat Hardened Images

## Remediation

Fix deferred

Workarounds / mitigations:

- If the Permission Model is unused, do not enable --permission.
When --permission is required, avoid relying on fs.realpathSync() for security boundaries; use APIs that enforce permission checks and keep --allow-fs-read minimal (CME-1303: https://cmetaxonomy.org/entries/CME-1303.html).
Apply OS-level confinement (SELinux, containers) as defense in depth (CME-301: https://cmetaxonomy.org/entries/CME-301.html; CME-702: https://cmetaxonomy.org/entries/CME-702.html).