{"id":"GHSA-29g2-3rmr-qm68","summary":"SvelteKit: ReDoS (O(n^2)) in content negotiation — unauthenticated DoS via the Accept header","details":"### Impact\nSvelteKit 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.\n\n### Patches\nThe vulnerability is patched in `@sveltejs/kit` version 2.70.2.","aliases":["CVE-2026-66062"],"modified":"2026-08-07T17:10:58.809703Z","published":"2026-08-07T16:50:02Z","database_specific":{"cwe_ids":["CWE-1333"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-08-07T16:50:02Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/sveltejs/kit/security/advisories/GHSA-29g2-3rmr-qm68"},{"type":"WEB","url":"https://github.com/sveltejs/kit/commit/82712fc02c24b1dcf5b25d7a52129cd8455f04f5"},{"type":"PACKAGE","url":"https://github.com/sveltejs/kit"},{"type":"WEB","url":"https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.70.2"}],"affected":[{"package":{"name":"@sveltejs/kit","ecosystem":"npm","purl":"pkg:npm/%40sveltejs/kit"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.70.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-29g2-3rmr-qm68/GHSA-29g2-3rmr-qm68.json","last_known_affected_version_range":"\u003c= 2.70.1"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}