CVE-2026-66062Medium· 5.3▾ SunlitSvelteKit 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 exp…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Aug 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
0.3% → 0.5%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
@sveltejs/kit <= 2.70.1Patched in:
@sveltejs/kit 2.70.2Connected by shared product, vendor, weakness, or advisory.
GHSA-85pr-xr59-r75hLow· 4.7Duplicate Advisory: SvelteKit before 3.0.0 XSS via Cache-Control Header in Prerendered Pages
GHSA-pvhg-7v4p-f5q9Low· 4.7Duplicate Advisory: SvelteKit before 3.0.0 Open Redirect via Enhanced Form Actions
CVE-2026-114060Low· 4.7SvelteKit: URL redirection to untrusted site via enhanced form submission
CVE-2023-29003High· 8.8SvelteKit vulnerable to Cross-Site Request Forgery
CVE-2023-29008High· 8.8SvelteKit framework has Insufficient CSRF protection for CORS requests
CVE-2024-23641High· 7.5Sending a GET or HEAD request with a body crashes SvelteKit