CVE-2026-66062

Published: Aug 7, 2026Modified: Aug 7, 2026

5.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitability: 3.9 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-1333

Inefficient Regular Expression Complexity

The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

References (3)

https://github.com/sveltejs/kit/commit/82712fc02c24b1dcf5b25d7a52129cd8455f04f5

Source: security-advisories@github.com

https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.70.2

Source: security-advisories@github.com

https://github.com/sveltejs/kit/security/advisories/GHSA-29g2-3rmr-qm68

Source: security-advisories@github.com

Timeline

No history available yet.