Prototype pollution in nestie

published 2021-06-03 5 y ago modified 2026-06-17 4 mo ago also GHSA-m7rg-8wvq-846v , EUVD-2021-1356

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.0%; EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

Prototype pollution vulnerability in 'nestie' versions 0.0.0 through 1.0.0 allows an attacker to cause a denial of service and may lead to remote code execution.

Patch / fix

fixed in 1 links 1

npm nestie 1.0.1

github.com/lukeed/nestie@bc80d58 commit

Exploit prediction

2.96% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

whitesourcesoftware.com https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25947 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	nestie	<1.0.1	1.0.1

Affected products

n/a nestie

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
CWE-913 Improper Control of Dynamically-Managed Code Resources

References

github.com /lukeed/nestie/commit/bc80d5898d1e5e8a3d325d355eda0c325c8dcfc2
web
whitesourcesoftware.com /vulnerability-database/CVE-2021-25947
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-25947
advisory

Sources

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