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CVE-2026-114062— SvelteKit before 3.0.0 SSRF via Redirects in Server-Side Self-Fetch Fallbacks

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 3.0.0 之前的版本存在服务器端请求伪造（SSRF）漏洞。由于自取（self-fetch）回退机制会自动遵循 HTTP 重定向，远程攻击者可借此访问内部服务。攻击者可通过篡改 Host 或转发（forwarded）请求头，将回退请求指向其控制的服务器，进而利用重定向将请求导向内部服务。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114062

Vulnerability Information
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Vulnerability Title
SvelteKit before 3.0.0 SSRF via Redirects in Server-Side Self-Fetch Fallbacks
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit before 3.0.0 contains a server-side request forgery vulnerability that allows remote attackers to reach internal services because self-fetch fallbacks follow HTTP redirects automatically. Attackers can manipulate the Host or forwarded headers to point fallback requests at their server, which redirects them to internal services.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sveltejs kit 0 ~ 3.0.0 -

II. Public POCs for CVE-2026-114062

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III. Intelligence Information for CVE-2026-114062

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Vendor Advisories for CVE-2026-114062 (2)

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

CVE-2026-114063 7.5 HIGH SvelteKit 2.10.0 before 3.0.0 Path Traversal via vite preview on Windows
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-918

V. Comments for CVE-2026-114062

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