Resource exhaustion in Svelte Sveltekit
CVE-2026-82261
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/sveltejs/kit/security/advisories/GHSA-88qp-p4qg-rqm6 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/sveltekit-before-2.52.2-cpu-exhaustion-via-remote-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-82261?
- CVE-2026-82261 is a high-severity vulnerability in Svelte Sveltekit, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-28.
- How severe is CVE-2026-82261?
- High severity. CVSS v3 base score is 7.5 out of 10.