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CVE-2026-82257— SvelteKit before 2.69.1 Prototype Pollution via File Input

Quick assessment

Affected
sveltejs kit
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.

Svelte kit是Svelte团队开源的一个Web应用开发框架。 Svelte kit 2.69.1之前版本存在输入验证错误漏洞，该漏洞源于远程表单函数中的文件输入字段接受任意用户控制的路径名，导致原型污染，攻击者可操纵删除路径移除原型上的方法，从而禁用应用程序功能。

CVSS 4.3 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
sveltejs kit < 2.69.1 affected
2.69.1 unaffected
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I. Basic Information for CVE-2026-82257

Vulnerability Information
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Vulnerability Title
SvelteKit before 2.69.1 Prototype Pollution via File Input
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Svelte kit 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Svelte kit是Svelte团队开源的一个Web应用开发框架。 Svelte kit 2.69.1之前版本存在输入验证错误漏洞，该漏洞源于远程表单函数中的文件输入字段接受任意用户控制的路径名，导致原型污染，攻击者可操纵删除路径移除原型上的方法，从而禁用应用程序功能。
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
sveltejs kit 0 ~ 2.69.1 -

II. Public POCs for CVE-2026-82257

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III. Intelligence Information for CVE-2026-82257

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Vendor Advisories for CVE-2026-82257 (2)

Same Patch Batch · sveltejs · 2026-08-28 · 6 CVEs total

CVE-2026-82259 7.5 HIGH SvelteKit 2.49.0 before 2.53.3 Denial of Service via form
CVE-2026-82260 7.5 HIGH SvelteKit before 2.52.2 Memory Exhaustion via Remote Form Deserialization
CVE-2026-82261 7.5 HIGH SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization
CVE-2026-82258 5.9 MEDIUM SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch
CVE-2026-82256 5.3 MEDIUM SvelteKit before 2.69.1 Denial of Service via Remote Form

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-1321

V. Comments for CVE-2026-82257

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