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Vulnerability record · CVE-2026-22803 · published 15 January 2026

CVE-2026-22803: Svelte kit allocation without limits vulnerability

Svelte · Kit

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.

8.2 CVSS 4.0 High EPSS 0.60% · top 53.5% CWE-789 · CWE-789CWE-770 · Allocation without limits
8.2CVSS 4.0 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/sveltejs/kit/commit/8ed8155215b9a74012fecffb942ad9a793b274e5 Patch
https://github.com/sveltejs/kit/releases/tag/@sveltejs%[email protected] Release Notes
https://github.com/sveltejs/kit/security/advisories/GHSA-j2f3-wq62-6q46 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.4CVE-2025-67647Svelte adapter-node server-side request forgery (ssrf) vulnerabilitySvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.49.5, SvelteKit is vulnerable to a serve…EPSS 0.53%8.2CVE-2026-40073Svelte kit allocation without limits vulnerabilitySvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, reque…EPSS 0.96%7.5CVE-2024-23641Svelte adapter-node improper input validation vulnerabilitySvelteKit is a web development kit. In SvelteKit 2, sending a GET request with a body eg `{}` to a built and previewed/hosted sveltekit app throws `R…EPSS 0.76%6.3CVE-2026-40074Svelte kit vulnerabilitySvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside …EPSS 0.61%

Source: NIST National Vulnerability Database (record CVE-2026-22803), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.