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Fencer Vulns
high 7.5

CVE-2024-23641 json

Sending a GET or HEAD request with a body crashes SvelteKit

published 2024-01-24 2 y ago modified 2026-09-10 1 mo ago also GHSA-g5m6-hxpp-fc49 , EUVD-2024-0352

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm @sveltejs/kit 2.4.3
  • npm @sveltejs/adapter-node 2.1.2, 3.0.3, 4.0.1
  • svelte adapter-node 2.1.2, 3.0.3
  • svelte kit 2.4.3

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/sveltejs/kit/security/advisories/GHSA-g5m6-hxpp-fc49 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm @sveltejs/kit
>=2.0.0, <2.4.3
2.4.3
npm @sveltejs/adapter-node
>=2.0.0, <2.1.2
>=3.0.0, <3.0.3
>=4.0.0, <4.0.1
2.1.2
3.0.3
4.0.1

Affected products

  • sveltejs kit

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.