VULNERABILITY INTELLIGENCE

CVE-2026-66062

CVSS score5.3 MEDIUM
EPSS probability0.51%
CISA KEVNot currently listed
Published2026-08-07
Last modified2026-10-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Weakness classification

  • security-advisories@github.com: CWE-1333

Primary references