{"cve":"CVE-2026-73647","nvd":{"published":"2026-08-13T18:18:20.450","modified":"2026-10-24T15:10:00.190","status":"Deferred","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":5.6},"cwes":["CWE-1321"],"references":["https://github.com/quasarframework/quasar/commit/d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7","https://github.com/quasarframework/quasar/releases/tag/quasar-v2.22.0","https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j","https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-73647","score":0.00387,"percentile":0.32519,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-3r53-75j5-3g7j","url":"https://osv.dev/vulnerability/GHSA-3r53-75j5-3g7j","summary":"Quasar: Prototype pollution in the extend() utility","modified":"2026-08-13T18:51:16.673123Z","packages":[{"ecosystem":"npm","name":"quasar","purl":"pkg:npm/quasar","ranges":["<2.22.0"],"fixed":["2.22.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}