---
id: CVE-2026-73647
title: >-
  Quasar Framework is a framework for building high-performance Vue.js user
  interfaces
summary: >-
  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, ta…
severity: medium
cvss: 5.6
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-1321
published: '2026-08-13'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:02:22.660'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73647'
references:
  - url: >-
      https://github.com/quasarframework/quasar/commit/d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7
    label: security-advisories@github.com
  - url: 'https://github.com/quasarframework/quasar/releases/tag/quasar-v2.22.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j
    label: security-advisories@github.com
  - url: >-
      https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.0038
epssPercentile: 0.31925
ingestedAt: '2026-09-09T21:22:45.534Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.