SvelteKit has deserialization expansion in unvalidated `form` remote function leading to Denial of Service (experimental only)
Some relatively small inputs can cause very large files arrays in form handlers. If the SvelteKit application code doesn't check files.length or individual files' sizes and performs expensive processing with them, it can result in Denial of Service.
Only users with experimental.remoteFunctions: true who are using the form function and are processing the files array without validation are vulnerable.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @sveltejs/kit | >= 2.49.0, < 2.53.3 | 2.53.3 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U- Weakness (CWE)
CWE-770- Platform
- npm
- Package
@sveltejs/kit- Disclosed
- 28.02.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-fpg4-jhqr-589c - CC BY 4.0
Vulnerability history: @sveltejs/kit
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 04.2023 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 6
- Medium 8
- Low 3
Disclosures per year
- 2023: 2
- 2024: 3
- 2025: 1
- 2026: 11
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SvelteKit has deserialization expansion in unvalidated `form` remote function leading to Denial of Service (experimental only) this entry
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