Medium severity5.3NVD Advisory· Published Aug 7, 2026· Updated Sep 9, 2026
CVE-2026-66062
CVE-2026-66062
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@sveltejs/kitnpm | < 2.70.2 | 2.70.2 |
Affected products
2Patches
Vulnerability mechanics
References
4News mentions
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