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CVE-2026-84994

CVE-2026-84994 · Qwik: Crashing any Qwik Server via Resource thenable

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

Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-controlled thenables. An unauthenticated request can provide a plain object whose then property is a QRL for an unregistered symbol, causing an orphaned asynchronous rejection that terminates Node.js under its default unhandled-rejection policy. A single request can crash a server, and repeated requests can keep replicas unavailable. This issue is fixed in @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37.

CVSS 8.7 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • qwik

    Versions
    • < 2.0.0-beta37: Affected

    No fix published

  • qwik

    Versions
    • < 1.20.0: Affected

    No fix published

  • @builder.io/qwik npm

    Affected ranges
    • SEMVER: < 1.20.0

    Update to 1.20.0

  • @qwik.dev/core npm

    Affected ranges
    • SEMVER: < 2.0.0-beta37

    Update to 2.0.0-beta37

Original sources

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