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HIGH

is-arrayish@0.3.3 contains malware after npm account takeover

Published Sep 15, 2025

Description

is-arrayish checks if an object can be used like an Array. On 8 September 2025, an npm publishing account for is-arrayish was taken over after a phishing attack. Version 0.3.3 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 <script> 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. 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 package owner published new patch versions to help cache-bust those using private registries who might still have the compromised version cached. Users should update to the latest patch version, completely remove their node_modules directory, clean their package manager's global cache, and rebuild any browser bundles from scratch. Those operating private registries or registry mirrors should purge the offending versions from any caches. This issue is resolved in 0.3.4.

Affected products

Remediation

Red Hat statement

No Red Hat products use any compromised version of the impacted package(s). For more details see https://access.redhat.com/security/supply-chain-attacks-NPM-packages

Metrics

Weaknesses (1)

CWE-506

References (11)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner GitHub_M
Published Sep 15, 2025
Updated Sep 15, 2025
Reserved Sep 12, 2025
Link CVE-2025-59331
CISA Vulnrichment
Updated Sep 15, 2025
NVD
Status Deferred
Modified Jun 17, 2026
Link CVE-2025-59331
Red Hat
Severity Important
Public date Sep 15, 2025
Links CVE-2025-59331 - Bugzilla
GHSA-FRH7-2F84-V9MW