CVE-2026-128120
SvelteKit: DoS while parsing form data from a remote functions `form`
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 2.42.0 until 3.1.1, applications using the experimental remote functions flag and a remote form function could perform quadratic synchronous work while parsing a specially crafted request with many form entries. The parsing work could block the event loop for an extended period and deny service. This issue is fixed in 3.1.1.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| kit sveltejs |
>= 2.42.0, < 3.1.1 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/sveltejs/kit/security/advisories/GHSA-3r8g-jcqq-3p5jCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/sveltejs/kit/commit/24d8ee409d83c438330ff2850b4f159c1222aa27CNA: GitHub_M · x_refsource_MISC
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected]CNA: GitHub_M · x_refsource_MISC
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