engine.io
HighnpmCVE-2026-102599
What to do
Update engine.io to 6.6.10 or later.
npm install engine.io@6.6.10
A denial of service flaw affects the npm package engine.io. Affected versions: >= 6.6.0, < 6.6.10. Fixed from version 6.6.10. CVSS score 7.5.
What the flaw allows: The service can be knocked over cheaply.
- Package
- engine.io
- Ecosystem
- npm (JavaScript)
- Class
- Denial of service
- Affected versions
- >= 6.6.0, < 6.6.10
- CVSS
- 7.5
- Published on
- September 29, 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.