SvelteJS kit up to 3.1.0 query.batch information disclosure

Summaryinfo

A vulnerability was found in SvelteJS kit up to 3.1.0. It has been declared as problematic. This affects the function query.batch. Executing a manipulation can lead to information disclosure. This vulnerability is handled as CVE-2026-128119. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in SvelteJS kit up to 3.1.0 and classified as problematic. This vulnerability affects the function query.batch. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 2.60.1 until 3.1.1, applications using the experimental remote functions flag could assign the same generated identifier to separate non-exported query.batch functions. When those private functions shared a request batch, arguments intended for one function could be passed to another function, causing unexpected cross-function processing and possible disclosure of function arguments. This issue is fixed in 3.1.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-128119 since 11/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 3.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• SvelteJS

Name

• kit

Version

• 3.0
• 3.1.0

Website

• Product: https://github.com/sveltejs/kit/

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