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Qwik CVE-2026-25150

CRITICAL
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-02-03 security-advisories@github.com GHSA-xqg6-98cw-gxhq
Denial Of Service Privilege Escalation Authentication Bypass Qwik
9.3
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
9.3 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Feb 10, 2026 - 20:10 nvd
Patch available
CVE Published
Feb 03, 2026 - 22:16 nvd
CRITICAL 9.3

DescriptionGitHub Advisory

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.

AnalysisAI

Qwik JavaScript framework prior to 1.19.0 has a prototype pollution vulnerability that can lead to server-side code execution in SSR applications.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send HTTP POST request with malicious form field names
Exploit
formToObj() processes dot notation without sanitization
Execution
Pollute Object.prototype with arbitrary properties
Impact
Bypass authentication or escalate privileges
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Vulnerability AssessmentAI

Exploitation Qwik version prior to 1.19.0 with @builder.io/qwik-city middleware enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.3 with patch. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends crafted input that pollutes Object.prototype in Qwik's SSR context, chaining with server-side gadgets to achieve code execution.
Remediation Update Qwik to 1.19.0+. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all applications and services using Qwik framework versions prior to 1.19.0 through dependency scanning and asset inventory. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-25150 vulnerability details – vuln.today
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