SvelteKit has deserialization expansion in unvalidated `form` remote function leading to…
Priority LOW 38CWE-770Published · Updated
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-770.
Summary
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.
Why it matters now
Fix Fixed @sveltejs/kit (npm): 2.53.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | @sveltejs/kit (npm) | 2.49.0 to before 2.53.3 | 2.53.3 | Patch available | GHSA-fpg4-jhqr-589c |
- @sveltejs/kit (npm) Vendor— Affected 2.49.0 to before 2.53.3 Fixed in 2.53.3 Patch available GHSA-fpg4-jhqr-589c
Remediation
- Fix · GHSA-fpg4-jhqr-589c @sveltejs/kit (npm) Fixed in 2.53.3 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-fpg4-jhqr-589c
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences