Resource exhaustion in Svelte Sveltekit
CVE-2026-82256
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (34.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/sveltejs/kit/security/advisories/GHSA-wqjv-9729-c5q2 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/sveltekit-before-2.69.1-denial-of-service-via-remo… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-82256?
- CVE-2026-82256 is a medium-severity vulnerability in Svelte Sveltekit, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-08-28.
- How severe is CVE-2026-82256?
- Medium severity. CVSS v3 base score is 5.3 out of 10.