{"id":"GHSA-xqg6-98cw-gxhq","summary":"Prototype Pollution via FormData Processing in Qwik City","details":"### Summary\n\nA Prototype Pollution vulnerability exists in the `formToObj()` function within `@builder.io/qwik-city` middleware. The function processes form field names with dot notation (e.g., `user.name`) to create nested objects, but fails to sanitize dangerous property names like `__proto__`, `constructor`, and `prototype`. This allows unauthenticated attackers to pollute `Object.prototype` by sending crafted HTTP POST requests, potentially leading to privilege escalation, authentication bypass, or denial of service.\n\n### Impact\nAn unauthenticated attacker can supply specially crafted form field names that cause formToObj() to write dangerous keys (for example __proto__, constructor, prototype) into parsed objects. This results in Prototype Pollution of the server process and can cause privilege escalation, auth bypass, denial-of-service, or other global application integrity failures depending on how objects are used.","aliases":["CVE-2026-25150"],"modified":"2026-02-04T18:09:26.229679Z","published":"2026-02-03T20:49:22Z","database_specific":{"cwe_ids":["CWE-1321"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2026-02-03T20:49:22Z","nvd_published_at":"2026-02-03T22:16:30Z"},"references":[{"type":"WEB","url":"https://github.com/QwikDev/qwik/security/advisories/GHSA-xqg6-98cw-gxhq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25150"},{"type":"WEB","url":"https://github.com/QwikDev/qwik/commit/5f65bae2bc33e6ca0c21e4cfcf9eae05077716f7"},{"type":"PACKAGE","url":"https://github.com/QwikDev/qwik"}],"affected":[{"package":{"name":"@builder.io/qwik-city","ecosystem":"npm","purl":"pkg:npm/%40builder.io/qwik-city"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.19.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-xqg6-98cw-gxhq/GHSA-xqg6-98cw-gxhq.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L"}]}