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CVE-2026-82261— SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization

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（@sveltejs/kit）版本在 2.49.0 至 2.52.1 之间，若启用了实验性远程函数（experimental remote functions）和表单（form），则存在一个 CPU 资源耗尽漏洞，该漏洞位于表单反序列化（form deserialization）过程中。攻击者可以发送格式错误的表单数据，导致服务器在处理请求时变得无响应，从而引发拒绝服务（DoS）攻击。该问题已在 2.52.2 版本中修复。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-82261

Vulnerability Information
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Vulnerability Title
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sveltejs kit 2.49.0 ~ 2.52.1 -

II. Public POCs for CVE-2026-82261

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III. Intelligence Information for CVE-2026-82261

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Vendor Advisories for CVE-2026-82261 (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-2026-82258 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
CVE-2026-82257 4.3 MEDIUM SvelteKit before 2.69.1 Prototype Pollution via File Input

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-400

V. Comments for CVE-2026-82261

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