CVE-2026-40073— SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-node
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 2.57.1之前版本存在安全漏洞，该漏洞源于特定情况下请求可绕过BODY_SIZE_LIMIT，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40073
Vulnerability Information
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Vulnerability Title
SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-node
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node. This bypass does not affect body size limits at other layers of the application stack, so limits enforced in the WAF, gateway, or at the platform level are unaffected. This vulnerability is fixed in 2.57.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
SvelteKit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 2.57.1之前版本存在安全漏洞，该漏洞源于特定情况下请求可绕过BODY_SIZE_LIMIT，可能导致拒绝服务攻击。
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
II. Public POCs for CVE-2026-40073
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-40073 (1)
-
Merge commit from fork · sveltejs/kit@3202ed6 · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-40073 (1)
Vendor Pages for CVE-2026-40073 (1)
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Release @sveltejs/kit@2.57.1 · sveltejs/kit · GitHub x_refsource_MISC
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V. Comments for CVE-2026-40073
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