postcss-initial-provider (npm) · Malicious Code
Affects postcss-initial-providerSource GCVE Database
Malicious package : remove postcss-initial-provider and rotate any secrets on hosts that installed it.
Data as of 26 Oct 2026, 16:15 UTC
Malicious package
Published to npm · OSV MAL-2026-13696
What to do
Remove postcss-initial-provider 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 |
|---|---|---|
| npmpostcss-initial-provider | Affected
| Fixed in– |
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Description
The postcss-initial-provider npm package version 3.0.4 contains malicious code that executes arbitrary attacker-controlled payloads on any host that installs it. The package includes obfuscated code that queries Ethereum public RPC endpoints for transactions from a hardcoded wallet address, extracts IP addresses from the transaction data, fetches an XOR-encrypted payload from those IPs, decrypts it, and executes it both in-process and as a detached Node.js process. This behavior is unrelated to the package's legitimate functionality and represents a supply-chain compromise.