{"id":"CVE-2026-46510","summary":"Prototype pollution in form-data-objectizer via bracket-notation form keys","details":"form-data-objectizer converts FormData to object. Prior to 1.0.1, form-data-objectizer walks bracket-notation form keys (e.g. name[sub]) into nested objects without filtering __proto__, constructor, or prototype. A single HTTP form field whose name starts with __proto__[...] causes the library to mutate Object.prototype, which is a prototype pollution primitive of the entire Node.js process. This vulnerability is fixed in 1.0.1.","aliases":["GHSA-m2hg-wjq3-28wq"],"modified":"2026-07-15T01:49:21.028895440Z","published":"2026-05-29T13:40:22.772Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"fixed":"1.0.1"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-1321"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46510.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46510.json"},{"type":"ADVISORY","url":"https://github.com/kaspernj/form-data-objectizer/security/advisories/GHSA-m2hg-wjq3-28wq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46510"},{"type":"FIX","url":"https://github.com/kaspernj/form-data-objectizer/commit/7c54b99408e6e9cd6533b7245bf197dadc2a2dbc"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/kaspernj/form-data-objectizer","events":[{"introduced":"0"},{"fixed":"7c54b99408e6e9cd6533b7245bf197dadc2a2dbc"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46510.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L"}]}