CVE-2021-20089

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in purl 2.3.2 allows a malicious user to inject properties into Object.prototype.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-1321

Affected software

Vendor	Product	Versions
n/a	purl	2.3.2

References

https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/purl.mdExploit, Third Party Advisory
https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/purl.mdExploit, Third Party Advisory

Timeline

Published: Apr 23, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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