{"id":"CVE-2026-73647","revision":null,"records":[{"revision":"444ed7457e5b4c779d82498141b6012a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73647","aliases":[],"title":"Quasar Framework: Prototype pollution in Quasar extend() utility","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.","state":0,"publishedAt":"2026-08-13T17:57:09.014+00:00","modifiedAt":"2026-08-13T18:41:21.421+00:00","affected":[{"ecosystem":"Vendor product","name":"quasar","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"quasarframework\",\n                    \"product\": \"quasar\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.22.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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,"severity":"MEDIUM"}],"references":["https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j","https://github.com/quasarframework/quasar/commit/d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7","https://github.com/quasarframework/quasar/releases/tag/quasar-v2.22.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73647","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73647","identifiers":["CVE-2026-73647"]},"retained":false,"historicalAffected":[]},{"revision":"4100264edc6f4a00b3c1c7aaa96f6b4a","observedAt":"2026-10-25T15:19:09.409+00:00","statement":{"source":"nvd","id":"CVE-2026-73647","aliases":[],"title":"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, targe…","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.","state":0,"publishedAt":"2026-08-13T18:18:20.45+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":5.6,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73647","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-08-13T18:18:20.450","lastModified":"2026-10-24T15:10:00.190"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-73647","identifiers":["CVE-2026-73647"]},"retained":false,"historicalAffected":[]},{"revision":"d9016647dd1f4210abc42365aed7dfc2","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-3r53-75j5-3g7j","aliases":["CVE-2026-73647"],"title":"Quasar: Prototype pollution in the extend() utility","description":"### Summary\n\n`quasar@2.20.1`, the latest published version at the time of testing, appears to be vulnerable to prototype pollution through the public `extend()` utility exported from the package root.\n\nWhen `extend(true, target, source)` is used for a deep merge, attacker-controlled object keys are recursively copied into the target object without blocking prototype-pollution primitives such as `__proto__`, `constructor`, or `prototype`.\n\nThis can allow attacker-controlled properties to be written to `Object.prototype`.\n\n### Details\n\nAffected source:\n\n```text\nsrc/utils/extend/extend.js\n```\n\nDistributed files include:\n\n```text\ndist/quasar.server.prod.js\ndist/quasar.server.prod.cjs\ndist/quasar.client.js\n```\n\nThe package root publicly exports `extend`. During deep merge, source object keys are recursively assigned into the target object. If the source object contains an own `__proto__` property, the merge can descend into the prototype object and assign attacker-controlled properties onto `Object.prototype`.\n\n### PoC\n\n```bash\nrm -rf /tmp/quasar-extend-pp-poc\nmkdir /tmp/quasar-extend-pp-poc\ncd /tmp/quasar-extend-pp-poc\n\nnpm init -y >/dev/null\nnpm install quasar@2.20.1 vue@3.5.31 >/dev/null\n\ncat > hack.mjs <<'JS'\nimport { extend } from 'quasar';\n\ndelete Object.prototype.polluted;\n\nextend(true, {}, {\n  ['__proto__']: {\n    polluted: 'yes'\n  }\n});\n\nconsole.log(({}).polluted);\n\ndelete Object.prototype.polluted;\nJS\n\nnode ./hack.mjs\n```\n\nObserved output:\n\n```text\nyes\n```\n\nExpected output:\n\n```text\nundefined\n```\n\n### Impact\n\nThis is a prototype pollution vulnerability.\n\nIf an application passes user-controlled or partially user-controlled objects into `extend(true, ...)`, an attacker may be able to pollute `Object.prototype` in the same JavaScript process.\n\nDepending on how the polluted property is later consumed, this may lead to logic bypass, unsafe default option injection, denial of service, or other application-specific security impact.\n\n### Suggested Fix\n\nReject or safely ignore dangerous keys before assignment, including:\n\n```text\n__proto__\nprototype\nconstructor\n```\n\nThe merge implementation should also avoid descending into prototype-related properties during recursive merge.","state":0,"publishedAt":"2026-07-24T22:36:45+00:00","modifiedAt":"2026-08-13T18:51:16.673123+00:00","affected":[{"ecosystem":"npm","name":"quasar","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.22.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/quasarframework/quasar/security/advisories/GHSA-3r53-75j5-3g7j","https://github.com/quasarframework/quasar/commit/d0a95d95ab3c29d13e1b8ba8c5e5025fd6ce35e7","https://github.com/quasarframework/quasar","https://github.com/quasarframework/quasar/releases/tag/quasar-v2.22.0"],"sourceUrl":"https://github.com/advisories/GHSA-3r53-75j5-3g7j","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3r53-75j5-3g7j","identifiers":["GHSA-3r53-75j5-3g7j","CVE-2026-73647"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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