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CVE-2026-25224

CVE-2026-25224 · Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 3.7 · Low · EPSS 0.6% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • fastify

    Versions
    • < 5.7.3: Affected

    No fix published

  • fastify npm

    Affected ranges
    • SEMVER: < 5.7.3

    Update to 5.7.3

Original sources

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