high7.5
CVE-2026-40074
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @sveltejs/kit | <= 2.57.0 | 2.57.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Svelte | Kit | before 2.57.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/sveltejs/kit/commit/10d7b44425c3d9da642eecce373d0c6ef83b4fcd
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.57.1
- https://github.com/sveltejs/kit/security/advisories/GHSA-3f6h-2hrp-w5wx
- https://github.com/advisories/GHSA-3f6h-2hrp-w5wx
- https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.57.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-40074