{"cve":"CVE-2026-82259","nvd":{"published":"2026-08-28T12:16:38.953","modified":"2026-10-08T16:17:48.623","status":"Analyzed","description":"SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-502"],"references":["https://github.com/sveltejs/kit/security/advisories/GHSA-fpg4-jhqr-589c","https://www.vulncheck.com/advisories/sveltekit-2.49.0-before-2.53.3-denial-of-service-via-form"],"products":["svelte:sveltekit"],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-82259","score":0.00533,"percentile":0.44709,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-fpg4-jhqr-589c","url":"https://osv.dev/vulnerability/GHSA-fpg4-jhqr-589c","summary":"SvelteKit  has deserialization expansion in unvalidated `form` remote function leading to Denial of Service (experimental only)","modified":"2026-08-29T03:55:36.168482178Z","packages":[{"ecosystem":"npm","name":"@sveltejs/kit","purl":"pkg:npm/%40sveltejs/kit","ranges":[">=2.49.0 <2.53.3"],"fixed":["2.53.3"]}]}],"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."]}