CVE-2026-66062
Medium · 5.3CVSS
5.3
EPSS
0.5%
Published
Aug 7, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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