Criticalnpm1 affected version

ethers-jss

ethers-jss has 1 version on the npm registry flagged in 1 incident we track. Other versions of this package are not implicated - only the exact versions listed below were named by the source advisories.

Affected versions

Check what you actually have installed with npm ls ethers-jss.

ethers-jss@6.13.1

The incident that flagged it

Critical13 Jun 2026

Cyfirma multi-stage crypto-wallet campaign: moralis-sdk, ethers-jss, coinbase-wallet-utils, plus the `ethcompat` ethereum-C2 cluster

Cyfirma Research disclosed an 11-package npm campaign targeting Web3 / blockchain developers across three clusters: a YouTube-page-gated postinstall trojan in moralis-sdk (2.7M+ downloads from the legitimate package name), the ethers-jss / coinbase-wallet-utils private-key sweepers (both yanked 2026-06-10), three long-lived typosquats (ganach, solidty, stelar-sdk, live since 2024), and the ethcompat 5-pack (hardhat-deploy-utils, web3-deploy-helper, defi-sdk-core, ethers-compat, ethereum-dev-utils) that AES-256-GCM-encrypts stolen creds and embeds them in Ethereum transactions to an attacker wallet.

Versions named here: 6.13.1

What to do if you installed one of these

Treat the machine as compromised rather than simply upgrading. Packages in these incidents typically execute at install time, so the payload has already run with whatever credentials were in the environment.

1.Rotate every credential that machine or CI job could reach - registry tokens, cloud keys, SSH keys, CI secrets - from a different machine.
2.Pin to a version not listed above, then reinstall from a clean lockfile.
3.Clear caches and private mirrors. Artifactory, Nexus, Verdaccio, and devpi routinely keep serving a tarball after the public registry has pulled it.
4.Read the incident write-up above - recommended actions differ per incident, and some have specific indicators of compromise worth grepping your logs for.

Check your whole project

ethers-jss is one of many packages in these incidents, and it is usually pulled in as a transitive dependency rather than one you installed directly. Paste your package-lock.json to check every dependency at once - it runs in your browser and nothing is uploaded.

Check my package-lock.json All flagged npm packages

Other packages in the same incident

If ethers-jss is in your tree, these are worth checking too - they were published by the same campaign.

See the full incident

Version data comes from the public advisories cited on each incident page. We list only versions those advisories name - we don't infer additional ones. Think this is wrong or incomplete? Tell us.