What is CVE-2025-57330?

CVE-2025-57330 is a high-severity vulnerability in Web3js Web3-Core-Subscriptions, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2025-09-24.

How severe is CVE-2025-57330?

High severity. CVSS v3 base score is 7.5 out of 10.

Prototype Pollution in Web3js Web3-Core-Subscriptions

CVE-2025-57330

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.

Vulnerability class: Prototype Pollution

EPSS: 0.004 (29.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Web3js Web3-core-subscriptions
N/a — versions n/a

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

cve@mitre.org (Broken Link)
cve@mitre.org (Third Party Advisory)

Frequently asked questions

What is CVE-2025-57330?: CVE-2025-57330 is a high-severity vulnerability in Web3js Web3-Core-Subscriptions, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2025-09-24.
How severe is CVE-2025-57330?: High severity. CVSS v3 base score is 7.5 out of 10.