Which versions of postcss-initialize-provider are malicious?

The following npm versions of postcss-initialize-provider are flagged malicious: 3.0.4. Treat any of these as compromised.

How do I remediate postcss-initialize-provider if I installed it?

postcss-initialize-provider is a typosquat — you almost certainly intended a legitimately-named package. Remove postcss-initialize-provider, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

I already installed postcss-initialize-provider — how do I know if it already compromised me?

If postcss-initialize-provider was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is postcss-initialize-provider part of a known attack campaign?

Yes — postcss-initialize-provider is associated with the IN-MAL-2026-018376 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find postcss-initialize-provider across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for postcss-initialize-provider (version 3.0.4). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging postcss-initialize-provider across your stack and pipelines.

Malicious package

postcss-initialize-providernpm

postcss-initialize-provider is a confirmed malicious npm package (MAL-2026-14261) that typosquats a legitimate package to trick installs (malicious version 3.0.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in postcss-initialize-provider (npm)

MAL-2026-14261

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall postcss-initialize-provider

What this malware does

[email protected] presents itself as a PostCSS plugin (README, badges, and repository links reference the legitimate maximkoretskiy/postcss-initial project), but index.js contains a heavily obfuscated payload (obfuscator.io-style 244-entry string array with rotation and _0x-prefixed identifiers) appended to the plugin code. Decoded strings show the payload captures require and module onto the global object (global['r']=require, global['m']=module), imports http/https/zlib/child_process, and queries Ethereum RPC and block-explorer endpoints (drpc.org, blockscout.com/api, stapi.io, with eth_getBlockByNumber / eth_getTransactionCount / module=account&action=txlist calls) to retrieve attacker-controlled data staged on-chain, then executes it via child_process.spawn and the captured require handle. A CSS transformation plugin has no legitimate need for child_process, Ethereum RPC access, or global capture of require/module. The package name typosquats postcss-initial and reuses that project's presentation to distribute the loader.

Malicious versions

1 flagged

3.0.4

Indicators of compromise (SHA-256)

85729e0f775f02486ef631437f648a1661eced789fa66656248f9d4078ac3f16

Detection & response playbook

Typosquat

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for postcss-initialize-provider (version 3.0.4). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging postcss-initialize-provider across your stack and pipelines.
If you installed it — respond
postcss-initialize-provider is a typosquat — you almost certainly intended a legitimately-named package. Remove postcss-initialize-provider, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If postcss-initialize-provider was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks postcss-initialize-provider before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. postcss-initialize-provider on npm has been identified as a malicious package (version 3.0.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-018376

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks postcss-initialize-provider-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

All malware advisories How O3 detects malware Vulnerability database