What is CVE-2025-62381?

CVE-2025-62381 is a vulnerability in Ciscoheat Sveltekit-Superforms, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). Published 2025-10-15.

Is CVE-2025-62381 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Prototype Pollution in Ciscoheat Sveltekit-Superforms

CVE-2025-62381

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.

Vulnerability class: Prototype Pollution

EPSS: 0.005 (40.9th percentile) — read the EPSS interpretation.

Affected products

Ciscoheat Sveltekit-superforms — versions < 2.27.4

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-62381?: CVE-2025-62381 is a vulnerability in Ciscoheat Sveltekit-Superforms, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). Published 2025-10-15.
Is CVE-2025-62381 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.