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CVE-2026-114063— SvelteKit 2.10.0 before 3.0.0 Path Traversal via vite preview on Windows

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（@sveltejs/kit）2.10.0 至 3.0.0 版本在 Windows 平台的 Vite 预览服务器中存在路径遍历漏洞。该漏洞允许未认证的攻击者读取预渲染输出目录之外的文件。若攻击者能够通过网络访问或隧道连接到预览服务器，即可发送精心构造的请求，从而暴露服务器进程可读取的源代码、配置文件或凭据。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114063

Vulnerability Information
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Vulnerability Title
SvelteKit 2.10.0 before 3.0.0 Path Traversal via vite preview on Windows
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit (@sveltejs/kit) from 2.10.0 before 3.0.0 contains a path traversal vulnerability in the vite preview server on Windows that allows unauthenticated attackers to read files outside the prerendered output directory. Attackers who can reach the preview server through network access or a tunnel can send crafted requests to expose source code, configuration, or credentials readable by the server process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sveltejs kit 2.10.0 ~ 3.0.0 -

II. Public POCs for CVE-2026-114063

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III. Intelligence Information for CVE-2026-114063

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Other References for CVE-2026-114063 (2)

Same Patch Batch · sveltejs · 2026-10-21 · 4 CVEs total

CVE-2026-114062 5.3 MEDIUM SvelteKit before 3.0.0 SSRF via Redirects in Server-Side Self-Fetch Fallbacks
CVE-2026-114060 4.7 MEDIUM SvelteKit before 3.0.0 Open Redirect via Enhanced Form Actions
CVE-2026-114061 4.7 MEDIUM SvelteKit before 3.0.0 XSS via Cache-Control Header in Prerendered Pages

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-22

V. Comments for CVE-2026-114063

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