Prototype Pollution via FormData Processing in Qwik City_CVE-2026-25150

9.3 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

Description

Qwik is a performance focused javascript framework. Prior to version 1.19.0, a prototype pollution vulnerability exists in the formToObj() function within @builder.io/qwik-city middleware. The function processes form field names with dot notation (e.g., user.name) to create nested objects, but fails to sanitize dangerous property names like __proto__, constructor, and prototype. This allows unauthenticated attackers to pollute Object.prototype by sending crafted HTTP POST requests, potentially leading to privilege escalation, authentication bypass, or denial of service. This issue has been patched in version 1.19.0.

Basic Information

ID CVE-2026-25150

Source GitHub_M

Published Feb 3, 2026 at 21:12

Affected Product

Vendor QwikDev

Product qwik

Version < 1.19.0

Affected Versions QwikDev qwik < 1.19.0

CWE Classification

CWE-1321

References

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    "published": "2026-02-03T21:12:50.417Z",
    "modified": "2026-02-03T21:12:50.417Z",
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