CVE-2026-106073: Permission Model bypass with fs.realpathSync

Published Oct 21, 2026
·
Updated

A flaw in Node.js Permission Model filesystem enforcement leaves fs.realpathSync() without the required read permission checks. This is an incomplete fix of CVE-2026-21715, which only covered fs.realpathSync.native(). As a result, code running under --permission with restricted --allow-fs-read can still use fs.realpathSync() to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

Other sources

A flaw in Node.js Permission Model filesystem enforcement leaves fs.realpathSync() without the required read permission checks. This is an incomplete fix of CVE-2026-21715, which only covered fs.realpathSync.native().

As a result, code running under --permission with restricted --allow-fs-read can still use fs.realpathSync() to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories.

— Node.Js

Affected Software

29 affected componentsFixes available
Node.js Node.js>=22.0.0<22.23.4
22.23.4
Node.js Node.js>=24.0.0<24.22.1
24.22.1
Node.js Node.js>=26.0.0<26.12.1
26.12.1
Node.js Node.js>=22.0.0<22.23.4, >=24.0.0<24.22.1, >=26.0.0<26.12.1
22.23.424.22.126.12.1
All of the following
azurelinux/nodejs<24.22.1-0
24.22.1-0
Microsoft Azure Linux=3.0
bitnami/node<22.23.4
22.23.4
bitnami/node>=23.0.0<24.22.1
24.22.1
bitnami/node>=25.0.0<26.12.1
26.12.1
bitnami/node-min<22.23.4
22.23.4
bitnami/node-min>=23.0.0<24.22.1
24.22.1
bitnami/node-min>=25.0.0<26.12.1
26.12.1
ubuntu/nodejs*
ubuntu/nodejs*
ubuntu/nodejs*
ubuntu/nodejs*
ubuntu/nodejs*
ubuntu/nodejs*
ubuntu/nodejs*
ubuntu/nodejs*
alpine/nodejs<22.23.4-r0
22.23.4-r0
alpine/nodejs<22.23.4-r0
22.23.4-r0
alpine/nodejs<24.22.1-r0
24.22.1-r0
alpine/nodejs<24.22.1-r0
24.22.1-r0
alpine/nodejs-current<26.12.1-r0
26.12.1-r0
debian/nodejs*
debian/nodejs*
debian/nodejs<24.22.1+dfsg+~cs24.19.2-1
24.22.1+dfsg+~cs24.19.2-1
debian/nodejs<=18.20.4+dfsg-1~deb12u2, <=18.20.4+dfsg-1~deb12u3, <=20.19.2+dfsg-1+deb13u2, <=20.19.2+dfsg-1+deb13u3
24.22.2+dfsg+~cs24.19.2-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 22.23.4
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 24.22.1
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 26.12.1
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 22.23.4Fixed in 24.22.1Fixed in 26.12.1
  5. Upgrade

    Upgrade azurelinux/nodejs to a version that resolves this vulnerability.

    Fixed in 24.22.1-0
  6. Upgrade

    Upgrade bitnami/node to a version that resolves this vulnerability.

    Fixed in 22.23.4
  7. Upgrade

    Upgrade bitnami/node to a version that resolves this vulnerability.

    Fixed in 24.22.1
  8. Upgrade

    Upgrade bitnami/node to a version that resolves this vulnerability.

    Fixed in 26.12.1
  9. Upgrade

    Upgrade bitnami/node-min to a version that resolves this vulnerability.

    Fixed in 22.23.4
  10. Upgrade

    Upgrade bitnami/node-min to a version that resolves this vulnerability.

    Fixed in 24.22.1
  11. Upgrade

    Upgrade bitnami/node-min to a version that resolves this vulnerability.

    Fixed in 26.12.1
  12. Upgrade

    Upgrade debian/nodejs to a version that resolves this vulnerability.

    Fixed in 24.22.2+dfsg+~cs24.19.2-1
  13. Upgrade

    Upgrade alpine/nodejs to a version that resolves this vulnerability.

    Fixed in 22.23.4-r0
  14. Upgrade

    Upgrade alpine/nodejs to a version that resolves this vulnerability.

    Fixed in 24.22.1-r0
  15. Upgrade

    Upgrade alpine/nodejs-current to a version that resolves this vulnerability.

    Fixed in 26.12.1-r0
  16. Upgrade

    Upgrade debian/nodejs to a version that resolves this vulnerability.

    Fixed in 24.22.1+dfsg+~cs24.19.2-1

Event History

Oct 21, 2026
CVE Published
via Node.js·10:39 AM
Data Sourced
via Node.js·10:39 AM
SeverityAffected Software
Data Sourced
via Node.js·10:00 PM
Description
Oct 23, 2026
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·04:15 PM
Data Sourced
via MITRE·04:15 PM
DescriptionSeverityWeakness
Data Sourced
via Red Hat·04:22 PM
DescriptionSeverityAffected Software
Data Sourced
via OSV·05:17 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·05:17 PM
DescriptionSeverityWeakness
Exploit Published
via GitHub·11:48 PM
Oct 25, 2026
Data Sourced
via Microsoft·08:01 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·08:01 AM
Affected Software
Oct 29, 2026
Advisory Published
via OSV·08:56 AM

Parent advisories

This vulnerability appears in the following advisories.

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