Bug 2560638

Summary: CVE-2026-106073 nodejs24: Node.js: Filesystem read permission bypass via fs.realpathSync() [fedora-43]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: nodejs24Assignee: Jan Staněk <jstanek>
Status: NEW --- QA Contact:
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Priority: low    
Version: 43CC: aradchen, jstanek, tjuhasz
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
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Whiteboard: {"flaws": ["d6b45198-359f-454c-b1a1-1a1de2ba9a1c"]}
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Bug Blocks: 2560021    

Description Srikanth Balasubramanian 2026-10-26 12:50:55 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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**.