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CVE-2025-62381— sveltekit-superforms Prototype Pollution in `parseFormData` function of `formData.js`

Quick assessment

Affected
ciscoheat sveltekit-superforms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 2.27.3及之前版本存在安全漏洞，该漏洞源于formData.js中parseFormData函数存在原型污染，可能导致拒绝服务、类型混淆和潜在远程代码执行。

AI Predicted 8.1 Difficulty: Easy EPSS 0.73% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-62381

Vulnerability Information
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Vulnerability Title
sveltekit-superforms Prototype Pollution in `parseFormData` function of `formData.js`
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
SvelteKit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 2.27.3及之前版本存在安全漏洞，该漏洞源于formData.js中parseFormData函数存在原型污染，可能导致拒绝服务、类型混淆和潜在远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ciscoheat sveltekit-superforms < 2.27.4 -

II. Public POCs for CVE-2025-62381

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III. Intelligence Information for CVE-2025-62381

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IV. Related Vulnerabilities

Same weakness: CWE-1321