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High, CVSS 7.5amended

Sending a GET or HEAD request with a body crashes SvelteKit

CVE-2024-23641GHSA-g5m6-hxpp-fc49

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@sveltejs/kit 2.4.3; @sveltejs/adapter-node 4.0.1, 3.0.3, 2.1.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2024-23641: 0.76% estimated exploitation activity in the next 30 days; percentile 55.46 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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. 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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-g5m6-hxpp-fc49

  2. Revision 1 · created ·

    Published from osv record GHSA-g5m6-hxpp-fc49

Agent brief

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# Patch Next advisory brief: CVE-2024-23641

Advisory: Sending a GET or HEAD request with a body crashes SvelteKit
IDs: CVE-2024-23641, GHSA-g5m6-hxpp-fc49
Record: https://patchnext.com/advisories/cve-2024-23641 (revision 2, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @sveltejs/kit 2.4.3; @sveltejs/adapter-node 4.0.1, 3.0.3, 2.1.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @sveltejs/kit: affected >= 2.0.0, < 2.4.3; fixed in 2.4.3
- npm @sveltejs/adapter-node: affected >= 2.0.0, < 2.1.2; >= 3.0.0, < 3.0.3; >= 4.0.0, <= 4.0.0; fixed in 2.1.2, 3.0.3, 4.0.1

## Suggested inspection (read-only)
- `npm ls @sveltejs/kit --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @sveltejs/adapter-node --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @sveltejs/kit, @sveltejs/adapter-node.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-g5m6-hxpp-fc49 (OSV record GHSA-g5m6-hxpp-fc49 lists affected ranges: npm @sveltejs/kit >=2.0.0 =2.0.0 =3.0.0 =4.0.0 <4.0.1 (fixed))
- Verified: https://github.com/advisories/GHSA-g5m6-hxpp-fc49 (GitHub-reviewed advisory GHSA-g5m6-hxpp-fc49 lists affected ranges: npm @sveltejs/kit >=2.0.0 =2.0.0 =3.0.0 =4.0.0 <=4.0.0)

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