CVE-2026-66062
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Aug 07, 2026
Vendor
unknown
Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.70.2, the content negotiation header parser used by SvelteKit's request handling (for headers such as Accept) uses a regular expression vulnerable to quadratic backtracking, so a maliciously crafted header value can cause excessive CPU consumption and degrade or deny service. Version 2.70.2 fixes the issue.