web3-core-subscriptions has a Prototype Pollution vulnerability

HIGH 7.5CVE-2025-57330 · GHSA-hhf6-3xpg-pggx · Published 24/09/2025 · updated 17/06/2026

In short

CVE-2025-57330 is a HIGH (CVSS 7.5) vulnerability affecting web3-core-subscriptions (web3js), web3-core-subscriptions.
Chance of exploitation in the next 30 days (EPSS): 0.39%, higher than 33.5% of all vulnerabilities.
Fix: update to 1.10.4 or later.

Package	Affected versions	Patched versions
web3-core-subscriptions web3js	`< 1.10.4`	`1.10.4`
web3-core-subscriptions npm	`≤ 2.0.0-alpha.1`	No fix yet

Description

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.

NVD description

References

nvd.nist.gov/vuln/detail/CVE-2025-57330 · ADVISORY
web3/web3.js commit d966042 · WEB
VulnSageAgent/PoCs · WEB
VulnSageAgent/PoCs · WEB
web3/web3.js · PACKAGE

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