SvelteKit: ReDoS (O(n^2)) in content negotiation — unauthenticated DoS via the Accept header
### Impact SvelteKit is vulnerable to remote CPU-exhaustion DoS attacks via specifically-crafted `Accept` headers. The impact is mitigated by default header length limits on most platforms, but in the case of raised or absent limits a denial of service is possible. ### Patches The vulnerability is patched in `@sveltejs/kit` version 2.70.2.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-66062US | — | — | ||
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… | ||||
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references
External citations — patches, advisories, analysis.
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