yayson
CriticalnpmCVE-2026-61534
What to do
Update yayson to 4.3.0 or later.
npm install yayson@4.3.0
A remote code execution flaw affects the npm package yayson. Affected versions: <= 4.2.0. Fixed from version 4.3.0. CVSS score 9.1.
What the flaw allows: An attacker can make the service run their own code.
- Package
- yayson
- Ecosystem
- npm (JavaScript)
- Class
- Remote code execution
- Affected versions
- <= 4.2.0
- CVSS
- 9.1
- Published on
- September 11, 2026
Sources
Entry built automatically from the cited security advisory, with no model rewriting. Acknowledged by the organisation or vendor, notified to an authority, or established by two independent sources.