npm

devplatform-npm-versions-checker @35.5.9

Vulnerability report · Last retrieved from osv.dev August 8, 2026 at 10:16 PM UTC

Malicious

OSV ID

MAL-2026-12721

Ecosystem

npm

Summary

On require of the package, _adapter.js fetches a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, cf102-baf.workers.dev, cf99-9b3.workers.dev, cf103-070.workers.dev) whose hostnames are hidden via [...].join('') string-splitting, with a DNS-TXT fallback channel that reassembles a base64 payload from numbered TXT records under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru). The fetched bytes are written to /tmp/.cache_<rand> on Unix or %TEMP%\dotnet_diag_<rand>.exe on Windows, chmod 0755'd, and detached-spawned via /bin/sh -c or cmd /c start /b. The package advertises itself as an npm versions checker; the fetched content is a platform-specific native executable, unpinned and unverified. Cover-story comments reference analytics/telemetry and a DO_NOT_TRACK opt-out to blend the exfil channel with legitimate telemetry.

Source: amazon-inspector (626fcec94d9938967e52e37c8973ffd825b75777018f0b58e6785036ff94d122)

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