Vulnerability details

CVE-2025-62381

ciscoheat sveltekit-superforms

sveltekit-superforms Prototype Pollution in `parseFormData` function of `formData.js`

CVSS 4.0

8.3High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.3High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
ciscoheat	sveltekit-superforms	< 2.27.4	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/ciscoheat/sveltekit-superforms/commit/4a1310dd1a94176bb22036662c530dad48059ca4 x_refsource_MISC
https://github.com/ciscoheat/sveltekit-superforms/security/advisories/GHSA-hwmc-4c8j-xxj7 x_refsource_CONFIRM

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Details

Published: 2025-10-15
Last updated: 2025-10-15
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.73%

Probability of exploitation in 30 days

54.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

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