{"id":"CVE-2026-54639","revision":null,"records":[{"revision":"7ee0e282dc564920ae6ea47537c635e6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54639","aliases":[],"title":"Style Dictionary - Prototype Pollution in convertTokenData utility function","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__`.","state":0,"publishedAt":"2026-06-24T00:17:44.889+00:00","modifiedAt":"2026-06-24T13:02:09.09+00:00","affected":[{"ecosystem":"Vendor product","name":"style-dictionary","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"style-dictionary\",\n                    \"product\": \"style-dictionary\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.3.0, < 5.4.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/style-dictionary/style-dictionary/security/advisories/GHSA-vj5c-m527-mpff","https://github.com/style-dictionary/style-dictionary/pull/1702","https://github.com/style-dictionary/style-dictionary/commit/209085d9782cfc0783c4d983f3f1bb2c515954ec","https://github.com/style-dictionary/style-dictionary/commit/23b5e8dda143441f0d6b8e2b4222e2da98058bc5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54639","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-54639","identifiers":["CVE-2026-54639"]},"retained":false,"historicalAffected":[]},{"revision":"19f8dfb8ebee4ae89eb6b490e08c8f4c","observedAt":"2026-11-07T12:30:29.045+00:00","statement":{"source":"euvd","id":"EUVD-2026-38640","aliases":["CVE-2026-54639","GHSA-vj5c-m527-mpff"],"title":"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: 'objec…","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__`.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":null}],"references":["https://github.com/style-dictionary/style-dictionary/security/advisories/GHSA-vj5c-m527-mpff","https://github.com/style-dictionary/style-dictionary/pull/1702","https://github.com/style-dictionary/style-dictionary/commit/209085d9782cfc0783c4d983f3f1bb2c515954ec","https://github.com/style-dictionary/style-dictionary/commit/23b5e8dda143441f0d6b8e2b4222e2da98058bc5"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38640","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 24, 2026, 12:17:44 AM","dateUpdated":"Jun 24, 2026, 1:02:09 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-38640","identifiers":["EUVD-2026-38640","CVE-2026-54639","GHSA-vj5c-m527-mpff"]},"retained":false,"historicalAffected":[]},{"revision":"dc099b4a4f794f9e8052140cb69f3361","observedAt":"2026-10-27T14:13:32.924+00:00","statement":{"source":"nvd","id":"CVE-2026-54639","aliases":[],"title":"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: 'objec…","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__`.","state":0,"publishedAt":"2026-06-24T01:16:25.363+00:00","modifiedAt":"2026-10-25T23:10:00.167+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/style-dictionary/style-dictionary/commit/209085d9782cfc0783c4d983f3f1bb2c515954ec","https://github.com/style-dictionary/style-dictionary/commit/23b5e8dda143441f0d6b8e2b4222e2da98058bc5","https://github.com/style-dictionary/style-dictionary/pull/1702","https://github.com/style-dictionary/style-dictionary/security/advisories/GHSA-vj5c-m527-mpff"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54639","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-06-24T01:16:25.363","lastModified":"2026-10-25T23:10:00.167"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-54639","identifiers":["CVE-2026-54639"]},"retained":false,"historicalAffected":[]},{"revision":"fdd2602cde5c4cf49a56dd2d51fe215d","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-vj5c-m527-mpff","aliases":["CVE-2026-54639"],"title":"Style Dictionary - Prototype Pollution in convertTokenData utility function","description":"### Impact\nPrototype pollution.\nA malicious user can create a token array `[{ key: '{__proto__.foo}', value: 'malicious' }]`, when processed by `convertTokenData()` utility function, it will pollute the Object.prototype globally where `{}.foo` will equal `{ key: '{__proto__.foo}', value: 'malicious' }`.\n\nThis has been confirmed with a test/reproduction.\n\nYou are impacted when:\n- direct usage of `convertTokenData(tokens, { output: 'object' });`\n- indirect usage, via using Expand API https://styledictionary.com/reference/config/#expand. If your expand config deems it necessary to run expand (this means, if NOT:  1) set to false, 2) all subprops set to false, or 3) undefined), then we sync the `sd.tokens` property with the `sd.tokenMap` property by converting tokenData map back to object.\n- indirect usage via SD's transform lifecycle. Once your tokens are transformed, we also have to sync the `sd.tokens` property with the `sd.tokenMap` property.\n\nImpact is high for this when style-dictionary is used as an integration in a NodeJS server application.\nImpact is moderate for when style-dictionary is used as an integration in a Web application.\nImpact 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.\n\n### Patches\nA patch has been published: version `5.4.4`.\nAny version within range `>=4.3.0 <5.4.4` contains this vulnerability, see commit hash 209085d for when the vulnerability was added.\n\nSee PR with repro + fix https://github.com/style-dictionary/style-dictionary/pull/1702\n\n### Workarounds\nA workaround is to sanitize your token data first. Whether using DTCG format or old Style Dictionary format, you have to check the token data object recursively for any object keys that include `__proto__`.\n\nYou can do this with the StyleDictionary instance too, just ensure that expand has to be set to false to prevent the second method of this vulnerability from happening.\n\n```js\nconst sd = new StyleDictionary({ expand: false });\n\nif (sd.allTokens.some(tok => tok.key.includes('__proto__')) {\n  throw new Error('Found malicious token key, attempting to do prototype pollution.')\n}\n```","state":0,"publishedAt":"2026-07-28T22:23:03+00:00","modifiedAt":"2026-07-28T22:30:30.9995406+00:00","affected":[{"ecosystem":"npm","name":"style-dictionary","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.3.0"},{"kind":"fixed","version":"5.4.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/style-dictionary/style-dictionary/security/advisories/GHSA-vj5c-m527-mpff","https://nvd.nist.gov/vuln/detail/CVE-2026-54639","https://github.com/style-dictionary/style-dictionary/pull/1702","https://github.com/style-dictionary/style-dictionary/commit/209085d9782cfc0783c4d983f3f1bb2c515954ec","https://github.com/style-dictionary/style-dictionary/commit/23b5e8dda143441f0d6b8e2b4222e2da98058bc5","https://github.com/style-dictionary/style-dictionary","https://github.com/style-dictionary/style-dictionary/releases/tag/v5.4.4"],"sourceUrl":"https://github.com/advisories/GHSA-vj5c-m527-mpff","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-vj5c-m527-mpff","identifiers":["GHSA-vj5c-m527-mpff","CVE-2026-54639"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-07T20:07:23.8593986+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-07T20:07:23.8593986+00:00","lastSuccessAt":"2026-11-07T20:07:24.014368+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:24.014369+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-bb5c9d5a08063ef076042e33dd72a7d0ffa4c4487efdcf3106e29ba55ec2ad57-aac6631b84e101279eb6b1c3835f52bf7b26c50f4d25bc0fb35977235593f4a7","complete":true,"records":420943,"lastAttemptAt":"2026-11-07T20:07:23.1739993+00:00","lastSuccessAt":"2026-11-07T20:07:23.0712879+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:23.1739993+00:00","snapshotPublishedAt":"2026-11-07T19:18:33+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-c5a2504558b549559b8658a653596391","complete":true,"records":13633,"lastAttemptAt":"2026-11-07T20:19:26.3099435+00:00","lastSuccessAt":"2026-11-07T20:19:26.304+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:19:26.304+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-07T20:07:23.8593986+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T20:07:23.8593986+00:00","lastSuccessAt":"2026-11-07T20:07:24.0152025+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:24.0152028+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-191690d52ba04a91b1a2749fa6191ceb","complete":true,"records":13645,"lastAttemptAt":"2026-11-07T20:07:42.8841875+00:00","lastSuccessAt":"2026-11-07T20:07:42.881+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:42.881+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-0eb4d6dde62dffacd040ad992d4fd5a65cd7d0dc5f5f4cfa8b41967fc6f9ca5f","complete":true,"records":9914,"lastAttemptAt":"2026-11-07T20:07:23.800032+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:23.800032+00:00","snapshotPublishedAt":"2026-11-06T20:02:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-07T20:07:23.2420378+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:23.2420378+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-335633e78a15c9cde10a6025895b5617717087fb945489ae7e15d377bacf34a9","complete":true,"records":3055,"lastAttemptAt":"2026-11-07T20:07:23.8227715+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:23.8227715+00:00","snapshotPublishedAt":"2026-11-06T16:02:48+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-40ad6183a951565ace1520a9b4d631e1d0bfb1d4bf7c5574c375032559f3ff53","complete":true,"records":231292,"lastAttemptAt":"2026-11-07T20:07:23.4659623+00:00","lastSuccessAt":"2026-11-07T10:29:00.4821259+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:07:23.4659623+00:00","snapshotPublishedAt":"2026-11-07T09:32:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}