CVE-2026-25224

Description

Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation. This issue has been patched in version 5.7.3.

Weakness classification

• CWE-770: Allocation of Resources Without Limits or Throttling

Primary references

• security-advisories@github.com — Patch
• security-advisories@github.com — Vendor Advisory
• security-advisories@github.com — Permissions Required