CVE-2026-84994: CWE-248: Uncaught Exception in QwikDev qwik
Description
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 v4.0
Score 8.7high
Affected software
QwikDev
qwik
@builder.io
qwik
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-02T18:12:13.535Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ace852f2cdf04f6569fdf7a
Added to database: 10/13/2026, 19:23:27 UTC
Last updated: 10/13/2026, 19:35:56 UTC
Views: 5
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