UpHeron
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Servers and applications

CVE-2026-21715

Permission Model Bypass in realpathSync.native Allows File Existence Disclosure

Severity
Low 3.3
Published
24 Mar 2026
Last changed
19 Aug 2026
Added to UpHeron
21 Oct 2026
Fixed in
20.20.2, 22.22.2, 24.14.1, 25.8.2
Sources
NVD, nodejs

Description

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…

Affected software

SoftwareAffected versions
Node.jsServers and applications · cpe:a:nodejs:node.js
  • From 25.0.0 up to 25.8.1
  • From 25.0.0 before 25.8.2
  • From 24.0.0 up to 24.14.0
  • From 24.0.0 before 24.14.1
All 8 release lines
  • Every version up to 20.20.1
  • From 20.0.0 before 20.20.2
  • From 22.0.0 before 22.22.2
  • From 22.0.0 up to 22.22.1
  • From 24.0.0 before 24.14.1
  • From 24.0.0 up to 24.14.0
  • From 25.0.0 before 25.8.2
  • From 25.0.0 up to 25.8.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-21715
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-21715
  • Node.js security release https://nodejs.org/en/blog/vulnerability/march-2026-security-releases