CVE-2024-23641: Sending a GET or HEAD request with a body crashes SvelteKit

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-01-24 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

Svelte Adapter-Node: from 2.0.0 before 2.1.2; from 3.0.0 before 3.0.3; 4.0.0 — fixed in 2.1.2, 3.0.3
Svelte Kit: from 2.0.0 before 2.4.3 — fixed in 2.4.3

How to fix

Upgrade to a fixed version: Svelte Adapter-Node 2.1.2, 3.0.3; Svelte Kit 2.4.3. Check the vendor advisory for mitigations.

References

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