Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck

CVE-2026-82261SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization

High 7.5

In plain English

A high-severity uncontrolled resource consumption 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 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 57.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@sveltejs/kit	2.52.2	GHSA-88qp-p4qg-rqm6

Affected products (as reported)

Vendor	Product	Versions
sveltejs	kit	2.49.0 – before 2.52.1

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-88qp-p4qg-rqm6) vendor-advisory
VulnCheck Advisory: SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization third-party-advisory