PUBLISHED DATE: October 15, 2025CVE-2025-62381:
Denial of Service Vulnerability

Description

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.

Questions to Ask Vendors

1. Can you confirm whether your systems are affected by CVE-2025-62381, and if so, what steps are you currently taking to mitigate this vulnerability?
2. What is your estimated timeline for fully resolving CVE-2025-62381 in your products or services, and how will you communicate updates on this issue to us as your customer?

Recommended Actions

• Check out the advisory links provided below.

References

• https://capec.mitre.org/data/definitions/1.html
• https://capec.mitre.org/data/definitions/180.html
• https://capec.mitre.org/data/definitions/77.html
• https://nvd.nist.gov/vuln/detail/CVE-2025-62381