CVE-2026-73647
Received Received - Intake

Prototype Pollution in Quasar Framework

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: GitHub, Inc.

Description
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the public extend() utility in ui/src/utils/extend/extend.js recursively copied attacker-controlled object keys during extend(true, target, source) deep merges without rejecting an own __proto__ property. The merge could descend into the prototype object and write attacker-controlled properties to Object.prototype in the same JavaScript process. Applications that passed user-controlled or partially user-controlled objects to extend() could experience logic bypass, unsafe default-option injection, denial of service, or other application-specific impact when polluted properties were later consumed. This issue is fixed in version 2.22.0.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-73647
EUVD
EUVD-2026-58189

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
quasarframework quasar to 2.22.0 (exc)
quasarframework quasar 2.22.0
quasar_framework quasar to 2.22.0 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-1321 The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a prototype pollution vulnerability in the Quasar Framework's extend() utility. It allows attackers to inject malicious properties into Object.prototype by passing objects with keys like __proto__ during deep merges. This can alter application behavior, bypass logic, or cause crashes.

Detection Guidance

This vulnerability is specific to applications using Quasar Framework versions prior to 2.22.0. To detect it, check your application's Quasar version in package.json or by running npm list quasar. If the version is below 2.22.0, the application is vulnerable. Additionally, inspect your code for usage of the extend() utility with user-controlled objects.

Impact Analysis

It may lead to logic bypass, unsafe default-option injection, denial of service, or other application-specific issues when polluted properties are used. Attackers could manipulate application settings or crash the system.

Mitigation Strategies

Immediately upgrade Quasar Framework to version 2.22.0 or later. Update your dependencies using npm update quasar or by modifying package.json to specify version 2.22.0. If upgrading is not immediately possible, review all usages of extend() to ensure no user-controlled objects are passed to it.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-73647. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart