CVE-2021-42581

CriticalCVSS 9.1/10Last modified Jun 17, 2026

Description

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

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Weakness enumeration

CWE-1321

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/ramda/ramda/pull/3192Issue Tracking, Patch, Third Party Advisory
https://jsfiddle.net/3pomzw5g/2/Exploit, Third Party Advisory
https://github.com/ramda/ramda/pull/3192Issue Tracking, Patch, Third Party Advisory
https://jsfiddle.net/3pomzw5g/2/Exploit, Third Party Advisory

Timeline

Published: May 10, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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