CVE-2026-32701

The record

Qwik is a performance-focused JavaScript framework. Versions prior to 1.19.2 improperly inferred arrays from dotted form field names during FormData parsing. By submitting mixed array-index and object-property keys for the same path, an attacker could cause user-controlled properties to be written onto values that application code expected to be arrays. When processing application/x-www-form-urlencoded or multipart/form-data requests, Qwik City converted dotted field names (e.g., items.0, items.1) into nested structures. If a path was interpreted as an array, additional attacker-supplied keys on that path—such as items.toString, items.push, items.valueOf, or items.length—could alter the resulting server-side value in unexpected ways, potentially leading to request handling failures, denial of service through malformed array state or oversized lengths, and type confusion in downstream code. This issue was fixed in version 1.19.2.

Affected packages

Related vulnerabilities

• GHSA-whhv-gg5v-864r Qwik City has array method pollution in FormData processing allows type confusion and DoS Same vulnerability
• CVE-2026-25151 Qwik is a performance focused javascript framework. Also affects @builder.io/qwik-city
• CVE-2026-25148 Qwik is a performance focused javascript framework. Also affects @builder.io/qwik-city
• CVE-2026-25155 Qwik is a performance focused javascript framework. Also affects @builder.io/qwik-city
• CVE-2026-25150 Qwik is a performance focused javascript framework. Also affects @builder.io/qwik-city
• CVE-2026-25149 Qwik is a performance focused javascript framework. Also affects @builder.io/qwik-city
• GHSA-vm6g-8r4h-22x8 Qwik City CSRF protection middleware does not work properly for content type header with… Also affects @builder.io/qwik-city
• GHSA-92j7-wgmg-f32m Qwik City Open Redirect via fixTrailingSlash Also affects @builder.io/qwik-city