{"id":"MAL-2026-17488","summary":"Malicious code in css-starting-style-polyfill (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (713c302594ab7c41e8034ca95478045afafba98e223ea62def160f080cb879cd)\nthunderboltRegistry.js runs an IIFE on module load that executes host reconnaissance commands via child_process.execSync (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts) and transmits the collected output together with hostname, platform, and pid to a hardcoded external URL https://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f via fetch. The package exports factories under names matching Wix internal registry modules (thunderboltRegistry, corvidRegistry, siteAssetsRegistry, editorRegistry, documentManagementRegistry) and ships a manifest referencing parastorage.com URLs, so any environment loading it as a drop-in Wix thunderbolt registry triggers the exfiltration payload on require(). The declared CSS @starting-style polyfill purpose has no relationship to the shipped behavior.\n","modified":"2026-10-04T23:30:05.615605477Z","published":"2026-10-04T23:15:24Z","database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-020893","import_time":"2026-10-04T23:16:30.856663153Z","modified_time":"2026-10-04T23:15:24Z","sha256":"713c302594ab7c41e8034ca95478045afafba98e223ea62def160f080cb879cd","source":"amazon-inspector","versions":["1.0.0"]}]},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/css-starting-style-polyfill/v/1.0.0"}],"affected":[{"package":{"name":"css-starting-style-polyfill","ecosystem":"npm","purl":"pkg:npm/css-starting-style-polyfill"},"versions":["1.0.0"],"database_specific":{"cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}],"indicators":{"evidence_files":[{"path":"thunderboltRegistry.js","sha256":"7dec0f17ab87d92ad6f508883b4e22a49a71f5eb68d69d67825b06e009ff6baf","tlsh":"437144a5b99df02066c33438cb7f4049b4bbd6672d6caee0740999b01f7985c01be6f8"}],"package_integrity":[{"filename":"css-starting-style-polyfill-1.0.0.tgz","hashes":{"sha512_sri":"sha512-uRr+IZqVaVjFM3aS4E9e1sW5FoT5SSEtkNBaFFMieApOGIfaAgmmU+JwEPw3mZrMB+D2X0Xa4qL/opt9pbLfGQ==","sha1":"20fe059cb9c0e79288a4a5ce5140a96f8111b7de"}}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-starting-style-polyfill/MAL-2026-17488.json"}}],"schema_version":"1.9.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}