Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
QwikDev qwik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Qwik 是一个以性能为导向的 JavaScript 框架。在 @builder.io/qwik 1.20.0 和 @qwik.dev/core 2.0.0-beta.37 版本之前，默认的服务器端 qwik-json 反序列化过程会导致 ResourceSerializer.$fill$ 在将 resource._resolved 传递给 Promise.resolve 之前，未先拒绝攻击者控制的 thenable 对象。未经身份验证的请求可以提供一个普通对象，其 then 属性是一个指向未注册符号的 QRL（Q

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
@builder.io qwik < 1.20.0 affected
QwikDev qwik < 2.0.0-beta37 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-84994

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Qwik: Crashing any Qwik Server via Resource thenable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
QwikDev qwik < 2.0.0-beta37 -
@builder.io qwik < 1.20.0 -

II. Public POCs for CVE-2026-84994

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-84994

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-84994 (2)

Vendor Advisories for CVE-2026-84994 (1)

Other References for CVE-2026-84994 (1)

IV. Related Vulnerabilities

Same product: qwik
Same vendor: QwikDev
Same weakness: CWE-248

V. Comments for CVE-2026-84994

No comments yet

Leave a comment