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CVE-2026-54639 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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__`.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/style-dictionary/style-dictionary/commit/209085d9782cfc0783c4d983f3f1bb2c515954ec	[email protected]	Source CodeVendor
https://github.com/style-dictionary/style-dictionary/commit/23b5e8dda143441f0d6b8e2b4222e2da98058bc5	[email protected]	Source CodeVendor
https://github.com/style-dictionary/style-dictionary/pull/1702	[email protected]	Issue TrackingVendor
https://github.com/style-dictionary/style-dictionary/security/advisories/GHSA-vj5c-m527-mpff	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1321	Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')	[email protected]

Affected Products

Product	Versions
Style Dictionary	>= 4.3.0, < 5.4.4 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 5.4.4moderate effort Workaround:low effort Sanitize token data by recursively checking the token data object for any object keys that include '__proto__'. This can be done with the StyleDictionary instance by setting expand to false: const sd = new StyleDictionary({ expand: false }); if (sd.allTokens.some(tok => tok.key.includes('__proto__'))) { throw new Error('Found malicious token key, attempting to do prototype pollution.'); }

Product

Versions

Style Dictionary

>= 4.3.0, < 5.4.4 (semver)

CPE

No CPEs found in CPE dictionary for this product.

Remediation

Upgrade: 5.4.4moderate effort
Workaround:low effort
Sanitize token data by recursively checking the token data object for any object keys that include '__proto__'. This can be done with the StyleDictionary instance by setting expand to false: const sd = new StyleDictionary({ expand: false }); if (sd.allTokens.some(tok => tok.key.includes('__proto__'))) { throw new Error('Found malicious token key, attempting to do prototype pollution.'); }

Change History

2 change records found show changes

Date	Action	Recorded By
Jun 24, 2026	CVE Modified	CISA-ADP
Jun 24, 2026	New CVE Received	[email protected]