CVE-2026-40074CWE-755

SvelteKit's invalidated redirect in handle hook causes Denial-of-Service

Medium · published April 10, 2026

CVSS v4.0
6.3
EPSS
1%
Percentile
48.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
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
EPSS
0.00609 · 48.5th percentile
Weakness
CWE-755 · Improper Handling of Exceptional Conditions
Published
2026-04-10T16:26Z
EPSS history
Timeline
  • 10 APR 16:26Z
    SvelteKit's invalidated redirect in handle hook causes Denial-of-Service
    cvelistv5