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CVE-2026-54639— Style Dictionary - Prototype Pollution in convertTokenData utility function

Quick assessment

Affected
style-dictionary style-dictionary
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.

Style Dictionary Style Dictionary是Style Dictionary团队开源的一个基于设计令牌（Design Tokens）的跨平台样式构建系统，让你只需定义一次样式，就能自动导出为 iOS、Android、CSS、JS 等多种平台所需的格式。 Style Dictionary 4.3.0版本至5.4.4之前版本存在输入验证错误漏洞，该漏洞源于原型污染，可能导致攻击者利用convertTokenData或Expand API进行攻击。

CVSS 8.8 · High EPSS 0.36% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
style-dictionary style-dictionary >= 4.3.0, < 5.4.4 affected
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I. Basic Information for CVE-2026-54639

Vulnerability Information
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Vulnerability Title
Style Dictionary - Prototype Pollution in convertTokenData utility function
Source: CVE Program / CVE List V5
Vulnerability Description
Style Dictionary, a build system for creating cross-platform styles, has a prototype pollution vulnerability starting in version 4.3.0 and prior to version 5.4.4. Impact users have: direct usage of `convertTokenData(tokens, { output: 'object' });`; indirect usage, via using Expand API; and/or indirect usage via SD's transform lifecycle. Impact is high for this when style-dictionary is used as an integration in a NodeJS server application. Impact is moderate for when style-dictionary is used as an integration in a Web application. Impact is low for most common cases where the user of style-dictionary also maintains the tokens, and access is limited via read/write access to the repository/workflows where it is used. A patch has been published in version `5.4.4`. The only known workaround is to sanitize token data first. Whether using DTCG format or old Style Dictionary format, check the token data object recursively for any object keys that include `__proto__`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Style Dictionary 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Style Dictionary Style Dictionary是Style Dictionary团队开源的一个基于设计令牌（Design Tokens）的跨平台样式构建系统，让你只需定义一次样式，就能自动导出为 iOS、Android、CSS、JS 等多种平台所需的格式。 Style Dictionary 4.3.0版本至5.4.4之前版本存在输入验证错误漏洞，该漏洞源于原型污染，可能导致攻击者利用convertTokenData或Expand API进行攻击。
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
style-dictionary style-dictionary >= 4.3.0, < 5.4.4 -

II. Public POCs for CVE-2026-54639

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7117 chars
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III. Intelligence Information for CVE-2026-54639

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Patches & Fixes for CVE-2026-54639 (2)

Vendor Advisories for CVE-2026-54639 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321