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CVE-2026-22774— devalue vulnerable to denial of service due to memory exhaustion in devalue.parse

Quick assessment

Affected
sveltejs devalue
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.3.0版本至5.6.1版本存在安全漏洞，该漏洞源于类型化数组水合过程未检查输入假设，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.64% · P48

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
sveltejs devalue >= 5.3.0, < 5.6.2 affected
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I. Basic Information for CVE-2026-22774

Vulnerability Information
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Vulnerability Title
devalue vulnerable to denial of service due to memory exhaustion in devalue.parse
Source: CVE Program / CVE List V5
Vulnerability Description
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.3.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the typed array hydration expecting an ArrayBuffer as input, but not checking the assumption before creating the typed array. This vulnerability is fixed in 5.6.2.
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
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Svelte 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.3.0版本至5.6.1版本存在安全漏洞，该漏洞源于类型化数组水合过程未检查输入假设，可能导致拒绝服务。
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 devalue >= 5.3.0, < 5.6.2 -

II. Public POCs for CVE-2026-22774

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9918 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-22774

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

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

IV. Related Vulnerabilities

Same product: devalue
Same vendor: sveltejs
Same weakness: CWE-405

V. Comments for CVE-2026-22774

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