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    CVE-2026-25224

    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.

    Published:Feb 3, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 3, 2026
    EPSS Score:0.00017
    CVSS Score:3.7

    Affected Products

    Vendor
    Fastify
    Product
    Fastify

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-84504 (CVSS 8.1) — fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value resu…
    CVE-2026-16732 (CVSS 6.1) — fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard …
    CVE-2026-18504 (CVSS 5.4) — fastify is a fast and low overhead web framework for Node.js. Versions of fastify before 5.12.1 are affected b…
    CVE-2026-33806 (CVSS 7.5) — Impact: Fastify applications using schema.body.content for per-content-type body validation can have validati…
    CVE-2026-3635 (CVSS 6.1) — Summary When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: …
    CVE-2026-3419 (CVSS 5.3) — Fastify incorrectly accepts malformed `Content-Type` headers containing trailing characters after the subtype …
    CVE-2026-25223 (CVSS 7.5) — Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vul…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High