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CVE-2024-23641

Sending a GET or HEAD request with a body crashes SvelteKit

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.76%Up 0.7 points since Jan 31, 2024
90%50%10%1%

What each source reports

CVE List Score used 7.5

Sending a GET or HEAD request with a body crashes SvelteKit

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.

Record
CVE-2024-23641
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2024-0352 7.5

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.

Record
EUVD-2024-0352
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-g5m6-hxpp-fc49 7.5

Sending a GET or HEAD request with a body crashes SvelteKit

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.

<!-- ### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._ -->

PoC

<!-- _Complete instructions, including specific configuration details, to reproduce the vulnerability._ -->

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

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

Impact

<!-- _What kind of vulnerability is it? Who is impacted?_ -->

Denial of Service for apps using adapter-node

Record
GHSA-g5m6-hxpp-fc49
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
NVD 7.5

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.

Record
CVE-2024-23641
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
OSV 7.5

Sending a GET or HEAD request with a body crashes SvelteKit

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.

Record
CVE-2024-23641
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
OSVGHSA-g5m6-hxpp-fc49 7.5

Sending a GET or HEAD request with a body crashes SvelteKit

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.

<!-- ### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._ -->

PoC

<!-- _Complete instructions, including specific configuration details, to reproduce the vulnerability._ -->

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

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

Impact

<!-- _What kind of vulnerability is it? Who is impacted?_ -->

Denial of Service for apps using adapter-node

Record
GHSA-g5m6-hxpp-fc49
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
@sveltejs/kit
npm
 2.0.0 up to 2.4.3
2.4.3
@sveltejs/adapter-node
npm
 2.0.0 up to 2.1.2
2.1.2
@sveltejs/adapter-node
npm
 3.0.0 up to 3.0.3
3.0.3
@sveltejs/adapter-node
npm
 4.0.0 to 4.0.0
4.0.1
@sveltejs/adapter-node
npm
 4.0.0 up to 4.0.1
4.0.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-23641 is a high vulnerability (CVSS 7.5) in Svelte Adapter-node, published January 24, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.76%, the 55th percentile. Fixed in @sveltejs/kit 2.4.3.

References

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