EUVD-2026-13639
GHSA-whhv-gg5v-864r
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Description
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.
Analysis
Qwik, a performance-focused JavaScript framework, contains an array prototype pollution vulnerability in its FormData parsing logic that affects versions prior to 1.19.2. Attackers can submit specially crafted form field names using mixed array-index and object-property keys (e.g., items.0 alongside items.toString or items.length) to inject malicious properties into objects the application expects to be arrays, leading to denial of service through malformed array states, oversized lengths, or request handling failures. …
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Remediation
Within 24 hours: Inventory all applications using Qwik framework and identify those running versions prior to 1.19.2; immediately implement WAF rules to block malicious form field patterns (mixed array-index and object-property keys). Within 7 days: Upgrade all affected Qwik installations to version 1.19.2 or later; validate patch deployment across all environments. …
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Priority Score
Vendor Status
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| (unstable) | fixed | (unfixed) | - |
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External POC / Exploit Code
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