SvelteKit: DoS while parsing form data from a remote functions `form`

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128120
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 20:18:56 UTC
Updated2026-11-13 22:14:15 UTC
DescriptionSvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 2.42.0 until 3.1.1, applications using the experimental remote functions flag and a remote form function could perform quadratic synchronous work while parsing a specially crafted request with many form entries. The parsing work could block the event loop for an extended period and deny service. This issue is fixed in 3.1.1.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003460000 probability, percentile 0.286130000 (date 2026-11-14)

Problem Types: CWE-407 | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sveltejs Kit affected >= 2.42.0, < 3.1.1 Not specified

References

ReferenceSourceLinkTags
github.com/sveltejs/kit/security/advisories/GHSA-3r8g-jcqq-3p5j [email protected] github.com
github.com/sveltejs/kit/commit/24d8ee409d83c438330ff2850b4f159c1222aa27 [email protected] github.com
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
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