EUVD-2026-21504
GHSA-3f6h-2hrp-w5wx
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
SvelteKit versions prior to 2.57.1 are vulnerable to denial of service when the redirect() function is called from the handle server hook with HTTP header-invalid characters in the location parameter. An unauthenticated remote attacker can trigger an unhandled TypeError by supplying unsanitized user input to the redirect location, potentially causing application crashes on certain platforms. …
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