{"id":"CVE-2026-82257","aliases":["GHSA-866w-xmhq-wj7x"],"url":"https://o3.security/vulnerability/CVE-2026-82257","summary":"SvelteKit before 2.69.1 Prototype Pollution via File Input","details":"If you use remote form functions, have an input field of type `file`, and accept arbitrary user-controlled path names for the field, then you are vulnerable to a prototype pollution attack where the attacker can remove e.g. methods on the prototype.","published":"2026-08-28T10:49:41.355Z","modified":"2026-10-21T03:00:25.340715900Z","cvss":null,"epss":{"score":0.00205,"percentile":0.10734,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@sveltejs/kit","fixedVersion":"2.69.1"}],"fix":{"url":"https://github.com/sveltejs/kit/pull/16218","label":"sveltejs/kit#16218"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82257.json"},{"type":"ADVISORY","url":"https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82257"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/sveltekit-before-2.69.1-prototype-pollution-via-file-input"},{"type":"WEB","url":"https://github.com/sveltejs/kit/pull/16218"},{"type":"WEB","url":"https://github.com/sveltejs/kit/commit/df32f6fe86cdd0b68b650e3e4631e5896453dcd3"},{"type":"PACKAGE","url":"https://github.com/sveltejs/kit"},{"type":"WEB","url":"https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.69.1"},{"type":"WEB","url":"https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.0.0-next.7"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T03:00:25.340715900Z"}}