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CVE-2026-40073

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

Published: Apr 10, 2026Updated: Apr 15, 2026 Sources: CVE List NVDCWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 58.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

kitsvelte
Library
OSS Libraries / web-framework
kitsveltejs
Library
OSS Libraries / web-framework
svelteoss-projectOSS Librariesaka kit, sveltekit
sveltejsoss-projectOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

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

Timeline

Published
Apr 10, 2026
Last Updated
Apr 15, 2026

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