CVE-2025-62381: Ciscoheat Sveltekit-Superforms

High severity, CVSS 8.3. EPSS: 0.7% chance of exploitation in the next 30 days.

sveltekit-superforms makes SvelteKit forms a pleasure to use. sveltekit-superforms v2.27.3 and prior are susceptible to a prototype pollution vulnerability within the parseFormData function of formData.js. An attacker can inject string and array properties into Object.prototype, leading to denial of service, type confusion, and potential remote code execution in downstream applications that rely on polluted objects. This vulnerability is fixed in 2.27.4.

Affected products

• Ciscoheat Sveltekit-Superforms: before 2.27.4 (fixed in 2.27.4)

Published 2025-10-15. Last modified 2026-10-08.