Major npm Package Attack Hits 47M Weekly Downloads

🚨 npm poisoned

By CIAN
Sep 11, 2025, 2:49 PM
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The popular npm package "error-ex" with 47 million weekly downloads was compromised by attackers.​ The malicious code redirected MetaMask transactions to hacker-controlled addresses using visually similar addresses to deceive users during transaction signing.​

Cian Platform Status:

  • All systems safe - comprehensive audit of 5 frontend projects found zero compromised packages
  • Extra precautions taken - all package versions locked, updates paused until threat clears

Security Recommendations:

  • Hardware wallet users: Enable clear signing, verify every address digit-by-digit
  • Software wallet users: Consider pausing on-chain transfers temporarily
  • Developers: Check dependency versions immediately, rollback or lock to safe versions

Alephium also confirmed their wallets remain unaffected by the supply chain attack.​

Sources

Security Update: Cian is Safe What Happened: The npm package "error-ex" (47M weekly downloads) was poisoned by attackers. Affected websites would redirect MetaMask transactions to hacker addresses using similar-looking addresses to confuse users during signing. Cian's Status:

Charles Guillemet
Charles Guillemet
@P3b7_

🚨 There’s a large-scale supply chain attack in progress: the NPM account of a reputable developer has been compromised. The affected packages have already been downloaded over 1 billion times, meaning the entire JavaScript ecosystem may be at risk. The malicious payload works

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