CVE-2026-30226— devalue has prototype pollution in devalue.parse and devalue.unflatten
Quick assessment
Affected
sveltejs devalue
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.
devalue是Svelte开源的一个增强的JavaScript对象序列化库。 devalue 5.6.3及之前版本存在安全漏洞，该漏洞源于devalue.parse和devalue.unflatten容易受到通过特制有效载荷的原型污染攻击，可能导致拒绝服务或类型混淆。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-30226
Vulnerability Information
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Vulnerability Title
devalue has prototype pollution in devalue.parse and devalue.unflatten
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. In devalue v5.6.3 and earlier, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could lead to Denial of Service (DoS) or type confusion. This vulnerability is fixed in 5.6.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
devalue 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
devalue是Svelte开源的一个增强的JavaScript对象序列化库。 devalue 5.6.3及之前版本存在安全漏洞，该漏洞源于devalue.parse和devalue.unflatten容易受到通过特制有效载荷的原型污染攻击，可能导致拒绝服务或类型混淆。
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
II. Public POCs for CVE-2026-30226
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-30226 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-30226
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