Sending a GET or HEAD request with a body crashes SvelteKit

HIGH 7.5CVE-2024-23641 · GHSA-g5m6-hxpp-fc49 · Published 24/01/2024 · updated 17/06/2026

In short

CVE-2024-23641 is a HIGH (CVSS 7.5) vulnerability affecting adapter-node (svelte), kit (svelte), @sveltejs/adapter-node.
Chance of exploitation in the next 30 days (EPSS): 0.76%, higher than 55.4% of all vulnerabilities.
Fix: update to 2.1.2, 3.0.3, 2.4.3, 4.0.1 or later.

Package	Affected versions	Patched versions
adapter-node svelte	`= 4.0.0≥ 2.0.0, < 2.1.2≥ 3.0.0, < 3.0.3`	`2.1.23.0.3`
kit svelte	`≥ 2.0.0, < 2.4.3`	`2.4.3`
@sveltejs/adapter-node npm	`≥ 2.0.0, < 2.1.2≥ 3.0.0, < 3.0.3≥ 4.0.0, < 4.0.1`	`2.1.23.0.34.0.1`
@sveltejs/kit npm	`≥ 2.0.0, < 2.4.3`	`2.4.3`

Description

Summary

In SvelteKit 2 sending a GET request with a body eg {} to a SvelteKit app in preview or with adapter-node throws Request with GET/HEAD method cannot have body. and crashes the app.

node:internal/deps/undici/undici:6066
          throw new TypeError("Request with GET/HEAD method cannot have body.");
                ^

TypeError: Request with GET/HEAD method cannot have body.
    at new Request (node:internal/deps/undici/undici:6066:17)
    at getRequest (file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/node/index.js:107:9)
    at file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:181:26
    at call (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44795:7)
    at next (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44739:5)
    at file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:172:6
    at call (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44795:7)
    at next (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44739:5)
    at file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:211:27
    at call (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44795:7)

Node.js v20.11.0

TRACE requests will also cause the app to crash. Prerendered pages and SvelteKit 1 apps are not affected.

PoC

First do a fresh install of SvelteKit 2 with the example app. Typescript.

npm run build
npm run preview
Go to http://localhost:4173 (works)
curl -X GET -d "{}" http://localhost:4173/bye
Application crashes and http://localhost:4173 is down

Impact

Denial of Service for apps using adapter-node

NVD description

SvelteKit is a web development kit. In SvelteKit 2, sending a GET request with a body eg `{}` to a built and previewed/hosted sveltekit app throws `Request with GET/HEAD method cannot have body.` and crashes the preview/hosting. After this happens, one must manually restart the app. `TRACE` requests will also cause the app to crash. Prerendered pages and SvelteKit 1 apps are not affected. `@sveltejs/adapter-node` versions 2.1.2, 3.0.3, and 4.0.1 and `@sveltejs/kit` version 2.4.3 contain a patch for this issue.

References

sveltejs/kit security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2024-23641 · ADVISORY
sveltejs/kit commit af34142 · WEB
sveltejs/kit · PACKAGE

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Package

Affected versions

Patched versions

adapter-node

svelte

= 4.0.0≥ 2.0.0, < 2.1.2≥ 3.0.0, < 3.0.3

2.1.23.0.3

kit

svelte

≥ 2.0.0, < 2.4.3

2.4.3

@sveltejs/adapter-node

npm

≥ 2.0.0, < 2.1.2≥ 3.0.0, < 3.0.3≥ 4.0.0, < 4.0.1

2.1.23.0.34.0.1

@sveltejs/kit

npm

≥ 2.0.0, < 2.4.3

2.4.3

Description

Summary

In SvelteKit 2 sending a GET request with a body eg {} to a SvelteKit app in preview or with adapter-node throws Request with GET/HEAD method cannot have body. and crashes the app.

node:internal/deps/undici/undici:6066
          throw new TypeError("Request with GET/HEAD method cannot have body.");
                ^

TypeError: Request with GET/HEAD method cannot have body.
    at new Request (node:internal/deps/undici/undici:6066:17)
    at getRequest (file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/node/index.js:107:9)
    at file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:181:26
    at call (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44795:7)
    at next (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44739:5)
    at file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:172:6
    at call (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44795:7)
    at next (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44739:5)
    at file:///C:/Users/admin/Desktop/reproduction/node_modules/@sveltejs/kit/src/exports/vite/preview/index.js:211:27
    at call (file:///C:/Users/admin/Desktop/reproduction/node_modules/vite/dist/node/chunks/dep-9A4-l-43.js:44795:7)

Node.js v20.11.0

TRACE requests will also cause the app to crash. Prerendered pages and SvelteKit 1 apps are not affected.

PoC

First do a fresh install of SvelteKit 2 with the example app. Typescript.

npm run build
npm run preview
Go to http://localhost:4173 (works)
curl -X GET -d "{}" http://localhost:4173/bye
Application crashes and http://localhost:4173 is down

Impact

Denial of Service for apps using adapter-node

NVD description