Uncontrolled Resource Consumption in fun-map

published 2020-04-28 6 y ago modified 2026-09-10 1 mo ago also GHSA-p33m-7w7f-gmj8 , EUVD-2021-2558

cvss: 8.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits: 0; none known

fun-map through 3.3.1 is vulnerable to Prototype Pollution. The function assocInM could be tricked into adding or modifying properties of 'Object.prototype' using a '__proto__' payload.

Exploit prediction

1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

snyk.io https://snyk.io/vuln/SNYK-JS-FUNMAP-564436 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	fun-map	<=3.3.1	no fix listed

Affected products

n/a fun-map

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

snyk.io /vuln/SNYK-JS-FUNMAP-564436
web, exploit, mitigation, third-party-advisory
github.com /nathan7/fun-map/blob/master/index.js#L137%2C
nvd.nist.gov /vuln/detail/CVE-2020-7644
advisory
github.com /nathan7/fun-map/blob/master/index.js#L137,
web

Sources

CVE List CVE-2020-7644
GitHub Advisory GHSA-p33m-7w7f-gmj8
NVD CVE-2020-7644

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