Qix node-is-arrayish 0.3.3 malicious code

Summaryinfo

A vulnerability was found in Qix node-is-arrayish 0.3.3. It has been classified as critical. Impacted is an unknown function. This manipulation causes malicious code. This vulnerability is registered as CVE-2025-59331. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Qix node-is-arrayish 0.3.3 and classified as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a malicious code vulnerability. The CWE definition for the vulnerability is CWE-506. The product contains code that appears to be malicious in nature. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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 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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-59331 since 09/12/2025. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

It is declared as attacked.

Upgrading to version 0.3.4 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Qix

Name

• node-is-arrayish

Version

• 0.3.3

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion