CVE-2025-47279: Node.js Undici

Low severity, CVSS 3.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use undici to implement a webhook-like system are vulnerable. If the attacker set up a server with an invalid certificate, and they can force the application to call the webhook repeatedly, then they can cause a memory leak. This has been patched in versions 5.29.0, 6.21.2, and 7.5.0. As a workaound, avoid calling a webhook repeatedly if the webhook fails.

Affected products

• Node.js Undici: before 5.29.0 (fixed in 5.29.0); from 6.0.0, before 6.21.2 (fixed in 6.21.2); from 7.0.0, before 7.5.0 (fixed in 7.5.0)

Published 2025-05-15. Last modified 2026-06-17.