Prototype Pollution

published 2022-07-17 4 y ago modified 2026-06-17 4 mo ago also GHSA-4hq8-jgr8-mw9j , EUVD-2022-6228

cvss: 4.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits: 0; none known

This affects all versions of package grunt-util-property. The function call could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

security.snyk.io https://security.snyk.io/vuln/SNYK-JS-GRUNTUTILPROPERTY-565088 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.0	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L/E:P/RL:U/RC:C
CNA	3.1	4.0	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	grunt-util-property	<=0.0.2	no fix listed

Affected products

n/a grunt-util-property

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

security.snyk.io /vuln/SNYK-JS-GRUNTUTILPROPERTY-565088
web, exploit, third-party-advisory
github.com /mikaelkaron/grunt-util-property/blob/master/main.js%23L41
web, broken-link, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-7641
advisory
github.com /mikaelkaron/grunt-util-property
package

Sources

CVE List CVE-2020-7641
GitHub Advisory GHSA-4hq8-jgr8-mw9j
NVD CVE-2020-7641

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary