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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-hwmc-4c8j-xxj7 `sveltekit-superforms` has Prototype Pollution in `parseFormData` function of `formData.js`
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 15 Oct 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 15 Oct 2025 17:30:00 +0000

Type Values Removed Values Added
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.
Title sveltekit-superforms Prototype Pollution in `parseFormData` function of `formData.js`
Weaknesses CWE-1321
References
Metrics cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-10-15T19:50:48.901Z

Reserved: 2025-10-10T14:22:48.205Z

Link: CVE-2025-62381

cve-icon Vulnrichment

Updated: 2025-10-15T19:50:39.595Z

cve-icon NVD

Status : Received

Published: 2025-10-15T18:15:40.230

Modified: 2025-10-15T20:15:36.837

Link: CVE-2025-62381

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.