Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

CVE-2026-40073SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-node

High 8.2

In plain English

A high-severity resource allocation without limits in kit from sveltejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.5%top 54.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@sveltejs/kit	2.57.1	GHSA-2crg-3p73-43xp

Affected products (as reported)

Vendor	Product	Versions
sveltejs	kit	< 2.57.1

Weakness: CWE-770 · Vector: 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

References

https://github.com/sveltejs/kit/security/advisories/GHSA-2crg-3p73-43xp x_refsource_CONFIRM
https://github.com/sveltejs/kit/commit/3202ed6c98f9e8d86bf0c4c7ad0f2e273e5e3b95 x_refsource_MISC
https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.57.1 x_refsource_MISC