GHSA-X586-XVC8-G7Q6 Qwik: Crashing any Qwik Server via Resource thenable

Summary A Qwik server in the default configuration can be crashed with one unauthenticated HTTP request. During qwik-json body parsing, ResourceSerializer.$fill$ does Promise.resolveresource.resolved. If resolved is a plain object whose .then is a QRL for an unregistered symbol, the async QRL...

EUVD-2026-99978

Qwik: Crashing any Qwik Server via Resource thenable...

CVE-2026-84994

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...

CVE-2026-84994: Uncaught Exception

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...

PT-2026-112710

Name of the Vulnerable Software and Affected Versions @builder.io/qwik versions prior to 1.20.0 @qwik.dev/core versions prior to 2.0.0-beta.37 Description Default server-side qwik-json deserialization allows an unauthenticated request to provide a plain object where the then property is a QRL for...

Qwik Dev: Improper exception handling leads to vulnerabilities

Qwik Dev Qwik has a vulnerability related to improper exception handling. This vulnerability stems from the default serialization process of qwik-json on the server side, which does not first reject the thenable controlled by the attacker. As a result, ResourceSerializer.$fill passes...

RCE using bad deserialization

Description Qwik provides an extended serialization mechanism for exchanging data between the client and server. This allows for the serialization and deserialization of Date, Regex, Signal, Function and many other useful data types. The Function deserializer can be accessed using the...