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Quasar Framework: Prototype pollution in Quasar extend() utility

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-73647
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 18:06 UTC · Revision 1

Source evidence

Quasar Framework: Prototype pollution in Quasar extend() utility

core-osv · Original source

Published 13 Aug 2026, 17:57 UTC

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.

osv:CVE-2026-73647
Complete source record
{
  "id": "2a62c7ee36a0841d4ac32ed736b1ab0bec836727bc812a371f0edefe38fcaf4a",
  "url": "https://osv.dev/vulnerability/CVE-2026-73647",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Quasar Framework: Prototype pollution in Quasar extend() utility",
    "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, 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.",
    "evidence": "osv:CVE-2026-73647",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-73647",
      "aliases": [
        "CVE-2026-73647",
        "GHSA-3r53-75j5-3g7j"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/quasarframework/quasar",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1bae220c1205e28b31d54621c8954a05947224bb"
                },
                {
                  "fixed": "d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.22.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1bae220c1205e28b31d54621c8954a05947224bb"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "quasar-v2.22.0"
                  }
                ]
              }
            }
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73647.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.034627060Z",
      "provider": "osv",
      "references": [
        "https://github.com/quasarframework/quasar/releases/tag/quasar-v2.22.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73647.json",
        "https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73647",
        "https://github.com/quasarframework/quasar/commit/d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1321"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73647.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73647",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498225,
  "published_at": "2026-08-13T17:57:09.014+00:00"
}