GHSA-29g2-3rmr-qm68MediumCVSS 5.3

SvelteKit: ReDoS (O(n^2)) in content negotiation — unauthenticated DoS via the Accept header

Published
August 7, 2026
Last Modified
August 7, 2026

🔗 CVE IDs covered (1)

CVE-2026-66062 →

📋 Description

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.

🎯 Affected products1

  • npm/@sveltejs/kit:<= 2.70.1

🔗 References (4)