Disclosure summary
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.
Source-reported weakness categories
CWE-502
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-82259
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| svelte | sveltekit | * {"versionStartIncluding":"2.49.0","versionEndExcluding":"2.53.3"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Vendor Advisory
- www.vulncheck.com — Third Party Advisory
PUBLISHED 2026-08-28T08:16:38-04:00
MODIFIED 2026-10-08T12:17:48-04:00
INGESTED 2026-10-10T20:50:36-04:00