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Malicious package

devplatform-cli-plugin-lintnpm

Advisory published Updated

devplatform-cli-plugin-lint is a confirmed malicious npm package (MAL-2026-12702) that executes malicious code on install (malicious version 35.5.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-cli-plugin-lint (npm)

MAL-2026-12702
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-cli-plugin-lint

What this malware does

On require() of the package, index.js loads bootstrap.js which selects a platform-specific asset path (linux_x64, linux_arm64, darwin, win32), downloads an opaque binary over HTTPS from one of four hardcoded Cloudflare Workers subdomains (oob-worker.cf100-.workers.dev through cf103-.workers.dev) with a DNS-TXT fallback channel resolving *.dl.wel1.ru hosts (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), writes it to /var/tmp or %TEMP% under a randomized name such as.cache<hex> or dotnet_diag_<hex>.exe, chmods 0755 on Unix, and spawns it detached via /bin/sh -c or cmd.exe. Hostnames and dangerous API names (child_process, chmodSync) are reconstructed from split-string arrays via Array.join('') to evade static analysis. A secondary module lib/telemetry.js (81 KB) ships the same drop-and-execute primitives (base64 buffer decode, fs.chmodSync 0755, cp.spawn('/bin/sh', ['-c', filePath+' &'])) behind an 'analytics SDK' cover story. The package presents itself as a devplatform CLI lint plugin; the shipped code performs full-host remote code execution on library load.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

1 flagged
35.5.1

Indicators of compromise (SHA-256)

e8460a9cc2fce88e69d25156ea88612a5a67ffba26709ce88900d573e2f4b3ea
ea105640a744e8157c32baaf4d5826923dbd99cafbdf4c5652d633368d0c85eb

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for devplatform-cli-plugin-lint (version 35.5.1).

  2. If you installed it — respond

    Remove devplatform-cli-plugin-lint from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If devplatform-cli-plugin-lint was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. devplatform-cli-plugin-lint on npm has been identified as a malicious package (version 35.5.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015069GHSA-m3ch-p9vx-grpc

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-cli-plugin-lint-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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devplatform-cli-plugin-lint (npm) malicious package — MAL-2026-12702 | O3 Security