CVE-2023-37899: Feathersjs Feathers

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like `const message = ${{ toString: '' }}` which would cause the NodeJS process to crash when sending an unexpected Socket.io message like `socket.emit('find', { toString: '' })`. A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.

Affected products

• Feathersjs Feathers: before 4.5.18 (fixed in 4.5.18); from 5.0.0, before 5.0.8 (fixed in 5.0.8)

Published 2023-07-19. Last modified 2026-06-17.