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CVE-2025-57330

CVE-2025-57330: web3-core-subscriptions has a Prototype Pollution vulnerability

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.

(GitHub Advisory)

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CVE-2025-57330

CVE-2025-57330:

N/A

CVSS Score

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
web3-core-subscriptions	npm	<= 2.0.0-alpha.1

Technical Details

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Root Cause Analysis

The vulnerability advisory points to a prototype pollution vulnerability in the attachToObject function within the web3-core-subscriptions package. The provided commit is a large refactoring across the web3.js monorepo to improve handling of nullish values and to patch a prototype pollution vulnerability, as stated in the commit message. While the function attachToObject is not directly visible in the provided patch, the commit contains a clear fix for a prototype pollution vulnerability within the mergeDeep function located in the packages/web3-utils/src/objects.ts file. This function is a dependency of other packages in the monorepo. The vulnerability in mergeDeep lies in its failure to check for own properties before merging, allowing for the pollution of Object.prototype through a malicious __proto__ key. The fix introduces Object.hasOwnProperty.call(src, key) to prevent this. It is highly probable that the attachToObject function, mentioned in the advisory, was using this vulnerable mergeDeep function, and the patch to mergeDeep remediated the vulnerability in web3-core-subscriptions.

Vulnerable functions

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WAF Rule

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Reasoning

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