CVE-2026-128120
SvelteKit: DoS while parsing form data from a remote functions `form`
Description
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.
INFO
Published Date :
Nov. 13, 2026, 7:34 p.m.
Last Modified :
Nov. 13, 2026, 7:34 p.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update SvelteKit to version 3.1.1 or later.
- Disable experimental remote functions flag if not needed.
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CVE-2026-128120 vulnerability anywhere in the article.