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Description

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a server side request forgery (SSRF) and denial of service (DoS) under certain conditions. From 2.44.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route (export const prerender = true). From 2.19.0 through 2.49.4, the vulnerability results in a DoS when your app has at least one prerendered route and you are using adapter-node without a configured ORIGIN environment variable, and you are not using a reverse proxy that implements Host header validation. This vulnerability is fixed in 2.49.5.

PUBLISHED Reserved 2025-12-09 | Published 2026-01-15 | Updated 2026-01-15 | Assigner GitHub_M




HIGH: 8.4CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:N

Problem types

CWE-248: Uncaught Exception

CWE-918: Server-Side Request Forgery (SSRF)

Product status

>= 2.19.0, < 2.49.5
affected

References

github.com/...js/kit/security/advisories/GHSA-j62c-4x62-9r35

github.com/...ommit/d9ae9b00b14f5574d109f3fd548f960594346226

cve.org (CVE-2025-67647)

nvd.nist.gov (CVE-2025-67647)

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