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CVE-2025-67647— SvelteKit Denial of service and possible SSRF when using prerendering

Quick assessment

Affected
sveltejs kit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 2.49.5之前版本存在代码问题漏洞，该漏洞源于特定条件下存在缺陷，可能导致服务器端请求伪造和拒绝服务。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-67647

Vulnerability Information
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Vulnerability Title
SvelteKit Denial of service and possible SSRF when using prerendering
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
SvelteKit 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 2.49.5之前版本存在代码问题漏洞，该漏洞源于特定条件下存在缺陷，可能导致服务器端请求伪造和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sveltejs kit >= 2.19.0, < 2.49.5 -

II. Public POCs for CVE-2025-67647

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III. Intelligence Information for CVE-2025-67647

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Same Patch Batch · sveltejs · 2026-01-15 · 4 CVEs total

CVE-2026-22774 7.5 HIGH devalue vulnerable to denial of service due to memory exhaustion in devalue.parse
CVE-2026-22775 7.5 HIGH devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse
CVE-2026-22803 SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-248

V. Comments for CVE-2025-67647

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