CVE-2024-21505: WEB3 WEB3-Utils

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Versions of the package web3-utils before 4.2.1 are vulnerable to Prototype Pollution via the utility functions format and mergeDeep, due to insecure recursive merge. An attacker can manipulate an object's prototype, potentially leading to the alteration of the behavior of all objects inheriting from the affected prototype by passing specially crafted input to these functions.

Affected products

• WEB3 WEB3-Utils: before 4.2.1 (fixed in 4.2.1)

Published 2024-03-25. Last modified 2026-06-17.