MalwarePublished 11 Sep 2026Updated 23 Sep 2026

tailwind-form-kit (npm) · Malicious Code

Affects tailwind-form-kitSource GCVE Database

Malicious package : remove tailwind-form-kit and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 16:19 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-16139

What to do

Remove tailwind-form-kit from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmtailwind-form-kit	Affected 0.5.1 – 0.6.5 5 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (cccb2aed2f968e146b433d2a2600f17104f0dcacfd951190771f8e59aee3a252) tailwind-form-kit@0.6.4 impersonates @tailwindcss/forms (package.json sets repository to https://github.com/tailwindlabs/tailwindcss-forms) but src/index.js is a heavily obfuscated single-line loader (obfuscator.io string-array shape, all identifiers _0xNNNN). On require() — as would happen when the package is referenced from tailwind.config — the loader opens HTTP/HTTPS to Ethereum public RPCs (publicnode, drpc.org/eth, blockscout) and an Etherscan-like indexer at *stapi.io, queries a hardcoded sender address 0xa322E5f39aDC2490EfD311D3080e6f0121063e1a via eth_blockNumber / eth_getBlockByNumber / eth_getTransactionCount, extracts a base64/gzip/deflate/br-encoded payload from an x-payload-B64 header or transaction data, and invokes child_process.spawn('node',...) on the retrieved bytes. This is the EtherHiding fetch-and-exec pattern: the on-chain address acts as a mutable C2 pointer, and any developer or build machine that requires this package runs whatever code the attacker currently points it at. A CSS forms plugin has no legitimate reason to talk to Ethereum RPCs or spawn node on fetched bytes.

Impact

Any developer or build system that installs or requires tailwind-form-kit@0.6.4 will execute attacker-controlled code fetched dynamically from the Ethereum blockchain. This can lead to arbitrary code execution, compromise of build environments, theft of credentials, insertion of further malicious code, or other attacker actions. The malicious behavior is hidden behind obfuscation and masquerades as a legitimate CSS forms plugin, increasing the risk of unnoticed compromise.

Defensive guidance

Users should immediately remove tailwind-form-kit@0.6.4 from their projects and avoid installing or requiring this package. Verify dependencies to ensure no transitive inclusion of this malicious package. Use only trusted and verified packages from official sources. Monitor for any signs of compromise in development or build environments where this package was used.

Summary

The tailwind-form-kit package version 0.6.4 is a malicious npm package impersonating the legitimate @tailwindcss/forms. Its main script is heavily obfuscated and, when loaded, connects to multiple Ethereum public RPC endpoints and a blockchain indexer to query a hardcoded Ethereum address. It retrieves encoded payloads embedded in blockchain transaction headers or data, decodes them, and executes the resulting code via child_process.spawn('node', ...). This technique, known as EtherHiding, uses the blockchain as a mutable command-and-control channel, enabling attackers to remotely control code execution on any developer or build machine that installs this package.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 00:44 UTC

Technical details

References

Community reviews