CVE-2025-57330: WEB3JS WEB3-Core-Subscriptions

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The web3-core-subscriptions is a package designed to manages web3 subscriptions. A Prototype Pollution vulnerability in the attachToObject function of web3-core-subscriptions version 1.10.4 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.

Affected products

• WEB3JS WEB3-Core-Subscriptions: before 1.10.4 (fixed in 1.10.4)

Published 2025-09-24. Last modified 2026-06-17.