{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-73646", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-13T14:04:09.604Z", "datePublished": "2026-08-17T15:35:13.518Z", "dateUpdated": "2026-08-17T16:36:37.422Z"}, "containers": {"cna": {"title": "PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure", "problemTypes": [{"descriptions": [{"cweId": "CWE-22", "lang": "en", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849"}, {"name": "https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c", "tags": ["x_refsource_MISC"], "url": "https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c"}, {"name": "https://github.com/postcss/postcss/releases/tag/8.5.18", "tags": ["x_refsource_MISC"], "url": "https://github.com/postcss/postcss/releases/tag/8.5.18"}], "affected": [{"vendor": "postcss", "product": "postcss", "versions": [{"version": "< 8.5.18", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-17T15:35:13.518Z"}, "descriptions": [{"lang": "en", "value": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18."}], "source": {"advisory": "GHSA-r28c-9q8g-f849", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-17T16:35:17.036116Z", "id": "CVE-2026-73646", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-17T16:36:37.422Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "postcss", "vendor": "postcss", "versions": [{"status": "affected", "version": "< 8.5.18"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18."}], "id": "CVE-2026-73646", "lastModified": "2026-08-17T16:17:47.257", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-08-17T16:17:47.257", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c"}, {"source": "security-advisories@github.com", "url": "https://github.com/postcss/postcss/releases/tag/8.5.18"}, {"source": "security-advisories@github.com", "url": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.5.18)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "postcss", "source": "cna", "vendor": "postcss"}, "product": "postcss", "vendor": "postcss"}], "created": "2026-08-17T16:30:06.584944+00:00", "updated": "2026-08-17T16:30:06.690531+00:00", "vendors": ["postcss", "postcss$PRODUCT$postcss"]}