SvelteKit 2.49.0 before 2.53.3 Denial of Service via form
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.
CVE-2026-82259
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-82259
kit
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "sveltejs",
"product": "kit",
"versions": [
{
"status": "affected",
"version": "2.49.0",
"lessThan": "2.53.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "2.53.3",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/%40sveltejs/kit",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-82259
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12917 · Revision 1
- Added to Heist Feed
- Publisher date