---
id: "GHSA-3r8g-jcqq-3p5j"
page: "https://infrastack.ai/live/GHSA-3r8g-jcqq-3p5j"
kind: "vulnerability"
aliases: ["GHSA-3r8g-jcqq-3p5j"]
title: "DoS while parsing form data from a remote functions `form`"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "@sveltejs/kit", "fixed": ["3.1.1"], "affected": ">= 2.42.0, <= 3.1.0", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["cwe-407", "node", "package", "self-hosted", "sveltekit"]
not_affected_if: ["no-form-remote-function", "remote-functions-flag-off", "static-export"]
published_at: "2026-10-29T23:47:31+00:00"
first_seen_at: "2026-11-09T22:53:15+00:00"
updated_at: "2026-11-09T22:54:24+00:00"
sources: [{"source": "ghsa-repo", "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-3r8g-jcqq-3p5j", "first_seen_at": "2026-11-09T22:53:15+00:00"}]
exploit_sources: []
---

# DoS while parsing form data from a remote functions `form`

Link for people: https://infrastack.ai/live/GHSA-3r8g-jcqq-3p5j (this .md is for agents)

A specially crafted request to a SvelteKit form remote function can make form data parsing block the Node.js event loop for long periods. The result is a denial of service: the app stops responding to other requests while it is stuck.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- npm:@sveltejs/kit affected >= 2.42.0, <= 3.1.0 fixed 3.1.1

## How to check

- Check the installed version with `npm ls @sveltejs/kit`
- Search the project config for the experimental remote functions flag and for `form` remote functions in your source
- Only affected if both the flag is on and a `form` remote function is used

## Fix

- `@sveltejs/kit` `3.1.1` (affected range `>= 2.42.0`, `<= 3.1.0`)

## Timeline

- 2026-11-09T22:53:15+00:00 ghsa-repo https://github.com/sveltejs/kit/security/advisories/GHSA-3r8g-jcqq-3p5j

## Documents

- [advisory] Maintainer's advisory: github.com https://github.com/sveltejs/kit/security/advisories/GHSA-3r8g-jcqq-3p5j

## From the sources

This only affects applications using the experimental remote functions flag and utilizing the `form` remote function. A specially-crafted request could block the event loop for extended periods of time during parsing.

---

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