CVE-2026-40074
High
Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in a HTTP header, will cause an unhandled TypeError. This could result in DoS on some platforms, especially if the location passed to redirect contains unsanitized user input. This vulnerability is fixed in 2.57.1.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Svelte Kit
PublishedApr 10, 2026
First seenApr 10, 2026
Weakness typeCWE-755CWE-755
How to fix
Update
- svelte kit2.57.1 or later
- @sveltejs/kit2.57.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| svelte kit | v < 2.57.1 | 2.57.1 |
| @sveltejs/kitnpm | v < 2.57.1 | 2.57.1 |
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