sveltejs SvelteKit up to 2.53.2 Form form files resource consumption

Summaryinfo

A vulnerability was found in sveltejs SvelteKit up to 2.53.2 and classified as problematic. The impacted element is the function form of the component Form. Such manipulation of the argument files leads to resource consumption. This vulnerability is uniquely identified as CVE-2026-82259. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in sveltejs SvelteKit up to 2.53.2. Affected by this issue is the function form of the component Form. The manipulation of the argument files with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-82259 since 08/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 2.53.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-67585). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• sveltejs

Name

• SvelteKit

Version

• 2.53.0
• 2.53.1
• 2.53.2

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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