High, CVSS 8.8npmAmendedPublished
backslash@0.2.1 contains malware after npm account takeover
CVE-2025-59140 · GHSA-53mq-f4w3-f7qv
- Affected
- npm backslash >= 0.2.1, < 0.2.2
- Fixed in
- 0.2.2· Vendor fix available
- Issue
- Impact On 8 September 2025, the npm publishing account for `backslash` was taken over after a phishing attack. Version `0.2.1` was published, functionally identical to the previous patch version, but with a malware payload added attempting to redirect cryptocurrency transactions to the attacker's own addresses from within browser environments. Local environments, server environments, command line applications, etc. are not affected. If the package was used in a browser context (e.g. a direct ` ` inclusion, or via a bundling tool such as Babel, Rollup, Vite, Next.js, etc.) there is a chance the malware still exists and such bundles will need to be rebuilt. The malware seemingly only targets cryptocurrency transactions and wallets such as MetaMask. See references below for more information on the payload. Patches npm removed the offending package from the registry over the course of the day on 8 September, preventing further downloads from npm proper. On 13 September, the…
Recommended action: Upgrade to 0.2.2 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.