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nodejs node: A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read pe

Node.js · CVE-2026-21715
0 news outlets0 CERTs and agencies0 researchers

What is it?

A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync.native()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories. This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-read` is intentionally restricted.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
3.3
EPSS
0.2%
First seen
7 h ago
Status
corroborated

All Node.js vulnerabilities