---
id: "GHSA-rqw3-x7hx-mm3p"
page: "https://infrastack.ai/live/GHSA-rqw3-x7hx-mm3p"
kind: "vulnerability"
aliases: ["GHSA-rqw3-x7hx-mm3p"]
title: "`@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "@sveltejs/adapter-node", "fixed": ["6.0.1"], "affected": ">= 5.5.7, < 6.0.1", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["cwe-248", "node", "package", "self-hosted", "sveltekit"]
not_affected_if: ["other-adapter", "static-export"]
published_at: "2026-10-29T23:47:02+00:00"
first_seen_at: "2026-11-09T22:53:16+00:00"
updated_at: "2026-11-09T22:56:16+00:00"
sources: [{"source": "ghsa-repo", "url": "https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p", "first_seen_at": "2026-11-09T22:53:16+00:00"}]
exploit_sources: []
---

# `@sveltejs/adapter-node` crashes when proxying certain requests via `fetch`

Link for people: https://infrastack.ai/live/GHSA-rqw3-x7hx-mm3p (this .md is for agents)

The @sveltejs/adapter-node package can try to add a header to an immutable request in a way that crashes the Node server. An attacker can send crafted requests to stop the server from handling other requests.

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

## Affected

- npm:@sveltejs/adapter-node affected >= 5.5.7, < 6.0.1 fixed 6.0.1

## How to check

- Run `npm ls @sveltejs/adapter-node` in the project to see the installed version.
- Check that the version is not `>= 5.5.7` and `< 6.0.1`.

## Fix

- `@sveltejs/adapter-node` `6.0.1`

## Timeline

- 2026-11-09T22:53:16+00:00 ghsa-repo https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p

## Documents

- [advisory] Maintainer's advisory: github.com https://github.com/sveltejs/kit/security/advisories/GHSA-rqw3-x7hx-mm3p

## From the sources

In affected versions, `@sveltejs/adapter-node` can attempt to add a header to an immutable request in a context that causes the server to crash, denying service to any other requests routed to that server.

---

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