@sveltejs/kit: Unvalidated redirect in handle hook causes Denial-of-Service
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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @sveltejs/kit | < 2.57.1 | 2.57.1 |
References
- https://github.com/sveltejs/kit/security/advisories/GHSA-3f6h-2hrp-w5wx
- https://nvd.nist.gov/vuln/detail/CVE-2026-40074
- https://github.com/sveltejs/kit/commit/10d7b44425c3d9da642eecce373d0c6ef83b4fcd
- https://github.com/sveltejs/kit
- https://github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.57.1
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.57.1
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L- Weakness (CWE)
CWE-755- Platform
- npm
- Package
@sveltejs/kit- Disclosed
- 10.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-3f6h-2hrp-w5wx - CC BY 4.0
Vulnerability history: @sveltejs/kit
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 04.2023 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 6
- Medium 8
- Low 3
Disclosures per year
- 2023: 2
- 2024: 3
- 2025: 1
- 2026: 11
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