CVE-2021-42581: Ramdajs Ramda

Critical severity, CVSS 9.1. EPSS: 1.4% chance of exploitation in the next 30 days.

Prototype poisoning in function mapObjIndexed in Ramda 0.27.0 and earlier allows attackers to compromise integrity or availability of application via supplying a crafted object (that contains an own property "__proto__") as an argument to the function. NOTE: the vendor disputes this because the observed behavior only means that a user can create objects that the user didn't know would contain custom prototypes

Affected products

• Ramdajs Ramda: up to and including 0.27.0

Published 2022-05-10. Last modified 2026-06-17.