SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From 2.49.0 to 2.49.4, the experimental form remote function uses a binary data format containing a representation of submitted form data. A specially-crafted payload can cause the server to allocate a large amount of memory, causing DoS via memory exhaustion. This vulnerability is fixed in 2.49.5.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-j2f3-wq62-6q46 @sveltejs/kit has memory amplification DoS vulnerability in Remote Functions binary form deserializer (application/x-sveltekit-formdata)
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 22 Jan 2026 05:45:00 +0900

Type Values Removed Values Added
Weaknesses CWE-770
CPEs cpe:2.3:a:svelte:kit:*:*:*:*:*:node.js:*:*
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Fri, 16 Jan 2026 23:15:00 +0900

Type Values Removed Values Added
First Time appeared Svelte
Svelte kit
Vendors & Products Svelte
Svelte kit

Fri, 16 Jan 2026 04:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 16 Jan 2026 04:00:00 +0900

Type Values Removed Values Added
Description SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From 2.49.0 to 2.49.4, the experimental form remote function uses a binary data format containing a representation of submitted form data. A specially-crafted payload can cause the server to allocate a large amount of memory, causing DoS via memory exhaustion. This vulnerability is fixed in 2.49.5.
Title SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer
Weaknesses CWE-789
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-15T19:06:13.528Z

Reserved: 2026-01-09T22:50:10.287Z

Link: CVE-2026-22803

cve-icon Vulnrichment

Updated: 2026-01-15T19:06:10.859Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-15T19:16:06.120

Modified: 2026-01-21T20:34:46.277

Link: CVE-2026-22803

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-16T22:42:49Z

Weaknesses