{"id":"MAL-2026-18357","revision":null,"records":[{"revision":"30ade648870148a090e2d2a246854e54","observedAt":"2026-10-29T14:12:32.841+00:00","statement":{"source":"osv","id":"MAL-2026-18357","aliases":[],"title":"Malicious code in csvflow-schema (npm)","description":"csvflow-schema is described as a \"Lightweight CSV column-schema validation helper\" (index.js exports a small validateSchema function) and adds a postinstall script that runs `node ./postinstall.js` on npm install. postinstall.js writes the username, hostname, working directory, parent process id and install path to `csvflow_schema/pi_2c75177b.ok` in the system temp directory, starts `calc.exe` through `cmd /c start`, and sends an HTTPS GET to `https://cdn-status.mulderitsme.net/pi/2c75177b`, a fixed-id install beacon. The npm account f0x_mulder published 1.0.0 on 2026-10-26, a minute after a 0.0.0-stage placeholder, and npm removed the package 17 minutes later.\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (e9875c39a2aa68e4b0e18354d0fb7063c02f449d6f1f6b3c420f812cec979351)\ncsvflow-schema advertises itself as a CSV schema helper but ships a postinstall.js that, on npm install, unconditionally spawns calc.exe via `cmd /c start` and performs an HTTPS GET to the hardcoded non-publisher host cdn-status.mulderitsme.net with a per-install identifier path (/pi/2c75177b). The script also collects local identity data (os.userInfo().username, os.hostname(), process.cwd(), ppid) into a temp file. The code execution primitive (arbitrary child_process spawn at install time) and the callback to a hardcoded third-party host unrelated to any CSV functionality are consistent with a dropper or PoC that proves arbitrary code execution and network reachability on the installer. The declared package purpose (CSV schema helper) has no need for child_process, calculator invocation, or beaconing to an external domain.\n","state":0,"publishedAt":"2026-10-26T18:22:11+00:00","modifiedAt":"2026-10-29T13:30:04.7256112+00:00","affected":[{"ecosystem":"npm","name":"csvflow-schema","ranges":[],"versions":["1.0.0"],"rawVersionEvidence":null}],"metrics":[],"references":["https://www.npmjs.com/package/csvflow-schema","https://www.npmjs.com/package/csvflow-schema/v/1.0.0"],"sourceUrl":"https://osv.dev/vulnerability/MAL-2026-18357","license":"OSV · upstream source license applies","key":"osv:MAL-2026-18357","identifiers":["MAL-2026-18357"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-07T07:27:10.0308911+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-07T07:27:10.0308911+00:00","lastSuccessAt":"2026-11-07T07:27:10.1806401+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:10.180641+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-e2c080f02357fa2a3d144a661c51c212b571c4d7ae811251058237d8f5735e04","complete":true,"records":420765,"lastAttemptAt":"2026-11-07T07:27:09.5001885+00:00","lastSuccessAt":"2026-11-07T07:27:09.4258602+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:09.5001885+00:00","snapshotPublishedAt":"2026-11-07T07:18:10+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-27c3440f97484dda858dd714de0d758d","complete":true,"records":13630,"lastAttemptAt":"2026-11-07T07:38:48.4100635+00:00","lastSuccessAt":"2026-11-07T07:38:48.406+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:38:48.406+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":"2026-11-07T07:27:10.0308911+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T07:27:10.0308911+00:00","lastSuccessAt":"2026-11-07T07:27:10.181531+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:10.1815313+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-1262a9fa83024e28a1560dfc0c9cdf3c","complete":true,"records":13645,"lastAttemptAt":"2026-11-07T07:27:10.8526655+00:00","lastSuccessAt":"2026-11-07T06:27:08.533+00:00","error":null,"lastVerifiedAt":"2026-11-07T06:27:08.533+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":"2026-11-07T07:27:09.8729489+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:09.8729489+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":"2026-11-07T07:27:09.6560768+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:09.6560768+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":"2026-11-07T07:27:09.9878127+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:09.9878127+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-a0b728bc1c5526b5429930c00621636eba8655069c176697c3080f8377619ad7","complete":true,"records":231291,"lastAttemptAt":"2026-11-07T07:27:09.7648455+00:00","lastSuccessAt":"2026-11-07T00:28:51.1983528+00:00","error":null,"lastVerifiedAt":"2026-11-07T07:27:09.7648455+00:00","snapshotPublishedAt":"2026-11-06T23:33:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}