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CVE-2026-25150— Prototype Pollution via FormData Processing in Qwik City

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Qwik Dev开源的一款微型Web框架。 Qwik 1.19.0之前版本存在安全漏洞，该漏洞源于formToObj函数存在原型污染漏洞，可能导致未经身份验证的攻击者污染Object.prototype，引发权限提升、身份验证绕过或拒绝服务。

CVSS 9.3 · Critical EPSS 0.72% · P53
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I. Basic Information for CVE-2026-25150

Vulnerability Information
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Vulnerability Title
Prototype Pollution via FormData Processing in Qwik City
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Qwik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qwik是Qwik Dev开源的一款微型Web框架。 Qwik 1.19.0之前版本存在安全漏洞，该漏洞源于formToObj函数存在原型污染漏洞，可能导致未经身份验证的攻击者污染Object.prototype，引发权限提升、身份验证绕过或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
QwikDev qwik < 1.19.0 -

II. Public POCs for CVE-2026-25150

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III. Intelligence Information for CVE-2026-25150

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Vendor Advisories for CVE-2026-25150 (1)

Same Patch Batch · QwikDev · 2026-02-03 · 5 CVEs total

CVE-2026-25151 5.9 MEDIUM Qwik City has a CSRF Protection Bypass via Content-Type Header Validation
CVE-2026-25155 5.9 MEDIUM [qwik-city] CSRF protection middleware does not work properly for content type header with
CVE-2026-25149 Qwik City Open Redirect via fixTrailingSlash
CVE-2026-25148 Qwik SSR XSS via Unsafe Virtual Node Serialization

IV. Related Vulnerabilities

Same product: qwik
Same vendor: QwikDev
Same weakness: CWE-1321

V. Comments for CVE-2026-25150

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