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Vulnerability record · CVE-2026-82256 · published 28 August 2026

CVE-2026-82256: Sveltekit uncontrolled resource consumption vulnerability

Svelte · Sveltekit

SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to crash the Node process by sending large payloads. Repeated exploitation causes denial of service by repeatedly crashing the application process.

6.9 CVSS 4.0 Medium EPSS 0.42% · top 65.9% CWE-400 · Uncontrolled resource consumption
6.9CVSS 4.0 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
31 Aug 2026Last modified by NVD

Description

SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to crash the Node process by sending large payloads. Repeated exploitation causes denial of service by repeatedly crashing the application process.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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/security/advisories/GHSA-wqjv-9729-c5q2 Vendor Advisory
https://www.vulncheck.com/advisories/sveltekit-before-2.69.1-denial-of-service-via-remote-form Third Party Advisory

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Related vulnerabilities

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

8.8CVE-2023-29008Sveltekit server-side request forgery (ssrf) vulnerabilityThe SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a `+server.js` file, containing endpoint han…EPSS 0.37%8.8CVE-2023-29003Sveltekit cross-site request forgery vulnerabilitySvelteKit is a web development framework. The SvelteKit framework offers developers an option to create simple REST APIs. This is done by defining a …EPSS 0.56%8.7CVE-2026-82260Sveltekit uncontrolled resource consumption vulnerabilitySvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions (experimental.remoteFunctions) and form enabled contain a…EPSS 0.49%8.7CVE-2026-82261Sveltekit uncontrolled resource consumption vulnerabilitySvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability i…EPSS 0.49%8.7CVE-2026-82259Sveltekit deserialization of untrusted data vulnerabilitySvelteKit 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. W…EPSS 0.53%5.9CVE-2026-82258Sveltekit race condition vulnerabilitySvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge un…EPSS 0.24%5.3CVE-2026-82257Sveltekit prototype pollution vulnerabilitySvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary us…EPSS 0.36%2.0CVE-2024-53261Sveltekit cross-site scripting vulnerabilitySvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. "Unsanitized input from *the request URL* flows int…EPSS 0.33%

Source: NIST National Vulnerability Database (record CVE-2026-82256), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.