Permission Model bypass with fs.realpathSync

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

not scored

EPSS

• CVE-2026-106073: 0.25% estimated exploitation activity in the next 30 days; percentile 16.95 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

20 Oct 2026, 00:00 UTC

Last modified by the source

29 Oct 2026, 10:56 UTC

Source last checked

30 Oct 2026, 07:10 UTC

1. Revision 3 · amended · 30 Oct 2026

   Amended from osv record BIT-node-min-2026-106073

2. Revision 2 · amended · 30 Oct 2026

   Amended from osv record BIT-node-2026-106073

3. Revision 1 · created · 29 Oct 2026

   Published from vendor_advisory record nodejs-security-wg:core:202

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# Patch Next advisory brief: CVE-2026-106073

Advisory: Permission Model bypass with fs.realpathSync
IDs: CVE-2026-106073
Record: https://patchnext.com/advisories/cve-2026-106073 (revision 3, source checked 30 Oct 2026, 07:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: node-min 26.12.1, 24.22.1, 22.23.4; node 26.12.1, 24.22.1, 22.23.4; node 26.12.1, 24.22.1, 22.23.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Bitnami node-min: affected < 22.23.4; >= 23.0.0, < 24.22.1; >= 25.0.0, < 26.12.1; fixed in 26.12.1, 22.23.4, 24.22.1
- runtime node: affected >= 22.0.0, < 22.23.4; >= 24.0.0, < 24.22.1; >= 26.0.0, < 26.12.1; fixed in 26.12.1, 22.23.4, 24.22.1
- Bitnami node: affected < 22.23.4; >= 23.0.0, < 24.22.1; >= 25.0.0, < 26.12.1; fixed in 26.12.1, 22.23.4, 24.22.1

## Suggested inspection (read-only)
- Bitnami node-min: check the installed version with your package manager.
- runtime node: check the installed version with your package manager.
- Bitnami node: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on node-min, node.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://raw.githubusercontent.com/nodejs/security-wg/main/vuln/core/202.json (Node.js security working group core entry 202 lists CVE-2026-106073 affecting node >=22.0.0 =24.0.0 =26.0.0 <26.12.1)
- Verified: https://nodejs.org/dist/index.json (The nodejs.org release index dates the first patched release for CVE-2026-106073 to 2026-10-20.)
- Verified: https://osv.dev/vulnerability/BIT-node-min-2026-106073 (OSV record BIT-node-min-2026-106073 lists affected ranges: Bitnami node-min >=0 =23.0.0 =25.0.0 <26.12.1 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-node-2026-106073 (OSV record BIT-node-2026-106073 lists affected ranges: Bitnami node >=0 =23.0.0 =25.0.0 <26.12.1 (fixed))

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