What is CVE-2026-40073?

CVE-2026-40073 is a high-severity vulnerability in Svelte Kit, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-10.

How severe is CVE-2026-40073?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Svelte Kit

CVE-2026-40073

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node…

EPSS: 0.005 (42.4th percentile) — read the EPSS interpretation.

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.

Affected products

Svelte Kit
Sveltejs Kit — versions < 2.57.1

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-40073?: CVE-2026-40073 is a high-severity vulnerability in Svelte Kit, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-10.
How severe is CVE-2026-40073?: High severity. CVSS v3 base score is 7.5 out of 10.