Malicious code in tailwindcss-forms-styles (npm)

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (587d9a389f35a8ec2d3ed714c90f7daa43feb6875f4ce2e4280f5ce19569d895) The package name tailwindcss-forms-styles mimics the legitimate @tailwindcss/forms plugin, and its src/index.js copies that plugin's code verbatim as cover. Above the cover code, a top-level IIFE joins a ~140-element base64 string array, atob()-decodes it, and eval()s the result. The decoded loader queries public Ethereum RPC/Blockscout endpoints for the most recent transaction sent by hardcoded address 0xa322E5f3D311D3080e6f0121063e9aDC2490Ef1a, parses two IPv4 addresses out of the transaction recipient field, downloads an XOR-encoded JavaScript payload from staging URLs of the form http://<ip>:443/0x/cls and http://<ip>:443/0x/ls, and executes it via eval and a detached spawn('node', ['-e',...]) child process. Because the IIFE runs at module load, any consumer that performs require('tailwindcss-forms-styles') triggers remote code execution on the installer, with the command-and-control endpoint resolved dynamically from the blockchain so the C2 can be rotated without changing the package.

Source published

4 Oct 2026 23:25:12 UTC

Source modified

4 Oct 2026 23:45:18 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.