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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.

SvelteKit 在 2.69.1 版本之前存在原型污染漏洞，影响接受任意用户可控路径名称的远程表单函数中的文件输入字段。攻击者可以通过操纵删除路径来移除原型上的方法，从而潜在地禁用应用程序的部分功能。

CVSS 4.3 · Medium Updated Aug 28, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
sveltejs	kit	0 ~ 2.69.1	-

II. Public POCs for CVE-2026-82257

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-82257

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Vendor Advisories for CVE-2026-82257 (2)

🔗 Prototype pollution in file input deletion path in remote-function forms · Advisory · sveltejs/kit · GitHub vendor-advisory
🔗 SvelteKit before 2.69.1 Prototype Pollution via File Input | Advisories | VulnCheck third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-82257

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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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-82257

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-82257

III. Intelligence Information for CVE-2026-82257

Vendor Advisories for CVE-2026-82257 (2)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-82257

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