sveltejs/kit · Security
SvelteKit: ReDoS (O(n^2)) in content negotiation — unauthenticated DoS via the Accept header
- GHSA ID
- GHSA-29g2-3rmr-qm68
- CVE ID
- CVE-2026-66062
- Severity
- medium
- Published
- Updated
- CVSS
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v3
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
CWEs
- CWE-1333 · Inefficient Regular Expression Complexity