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CVE-2026-22803— SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer

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是Svelte开源的一套Web 开发框架。 SvelteKit 2.49.0版本至2.49.4版本存在安全漏洞，该漏洞源于实验性表单远程函数处理特制有效载荷不当，可能导致内存耗尽拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-22803

Vulnerability Information
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Vulnerability Title
SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From 2.49.0 to 2.49.4, the experimental form remote function uses a binary data format containing a representation of submitted form data. A specially-crafted payload can cause the server to allocate a large amount of memory, causing DoS via memory exhaustion. This vulnerability is fixed in 2.49.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
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 2.49.0版本至2.49.4版本存在安全漏洞，该漏洞源于实验性表单远程函数处理特制有效载荷不当，可能导致内存耗尽拒绝服务。
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 >= 2.49.0, < 2.49.5 -

II. Public POCs for CVE-2026-22803

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III. Intelligence Information for CVE-2026-22803

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Vendor Advisories for CVE-2026-22803 (1)

Same Patch Batch · sveltejs · 2026-01-15 · 4 CVEs total

CVE-2026-22774 7.5 HIGH devalue vulnerable to denial of service due to memory exhaustion in devalue.parse
CVE-2026-22775 7.5 HIGH devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse
CVE-2025-67647 SvelteKit Denial of service and possible SSRF when using prerendering

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-789

V. Comments for CVE-2026-22803

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