CVE-2026-54639

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Source
https://cve.org/CVERecord?id=CVE-2026-54639
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54639.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54639
Aliases
Published
2026-06-24T00:17:44Z
Modified
2026-08-12T03:51:31Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
Style Dictionary - Prototype Pollution in convertTokenData utility function
Details

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__.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54639.json"
}
References

Affected packages

Git / github.com/style-dictionary/style-dictionary

Affected ranges

Type
GIT
Repo
https://github.com/style-dictionary/style-dictionary
Events
Introduced
737a02b638b9450eb4f989fe9718357f5cba4239
Fixed
209085d9782cfc0783c4d983f3f1bb2c515954ec
Fixed
23b5e8dda143441f0d6b8e2b4222e2da98058bc5
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "4.3.0"
        },
        {
            "fixed": "5.4.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v4.*
v4.3.0
v4.3.1
v4.3.2
v4.3.3
v4.4.0
v5.*
v5.0.0
v5.0.1
v5.0.2
v5.0.3
v5.0.4
v5.1.0
v5.1.1
v5.1.2
v5.1.3
v5.1.4
v5.2.0
v5.3.0
v5.3.1
v5.3.2
v5.3.3
v5.4.0
v5.4.1
v5.4.2
v5.4.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54639.json"