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CVE-2026-82256— SvelteKit before 2.69.1 Denial of Service via Remote Form

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 版本之前未正确验证远程表单函数（remote form function）的载荷大小，攻击者可以通过发送超大载荷来使 Node 进程崩溃。反复利用该漏洞会导致应用进程反复崩溃，从而造成拒绝服务（DoS）。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1074 · Data Staged
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I. Basic Information for CVE-2026-82256

Vulnerability Information
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Vulnerability Title
SvelteKit before 2.69.1 Denial of Service via Remote Form
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to crash the Node process by sending large payloads. Repeated exploitation causes denial of service by repeatedly crashing the application process.
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:L
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 0 ~ 2.69.1 -

II. Public POCs for CVE-2026-82256

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III. Intelligence Information for CVE-2026-82256

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Vendor Advisories for CVE-2026-82256 (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-2026-82257 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-2026-82256

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