CVE-2026-82261
Analyzed Analyzed - Analysis Complete

Denial of Service in SvelteKit via Form Deserialization

Publication date: 2026-08-28

Last updated on: 2026-08-31

Assigner: VulnCheck

Description
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-31
Generated
2026-09-18
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
NVD
CVE-2026-82261
EUVD
EUVD-2026-67587

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
svelte sveltekit From 2.49.0 (inc) to 2.52.2 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

SvelteKit versions between 2.49.0 and 2.52.1 with experimental remote functions and form enabled have a CPU exhaustion vulnerability during form deserialization. Attackers can send malformed form data to make the server unresponsive, causing a denial of service.

Detection Guidance

Check if your SvelteKit version is between 2.49.0 and 2.52.1 by running: npm list @sveltejs/kit. If affected, monitor server CPU usage during form submissions for unusual spikes.

Impact Analysis

This vulnerability can cause your SvelteKit server to become unresponsive or crash when processing malicious form submissions. This leads to downtime, degraded performance, or complete service unavailability for legitimate users.

Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by causing denial of service through CPU exhaustion, potentially leading to service unavailability. For GDPR, this may affect the right to access services, while for HIPAA, it could disrupt critical healthcare operations.

Mitigation Strategies

Upgrade SvelteKit to version 2.52.2 or later using: npm update @sveltejs/kit. Disable experimental remote functions if not required.

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