Prototype pollution in nconf-toml

published 2021-05-25 5 y ago modified 2026-06-17 4 mo ago also GHSA-hx7j-43w2-7rj7 , EUVD-2021-1338

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.3%; EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits: 0; none known

Prototype pollution vulnerability in `nconf-toml` versions 0.0.1 through 0.0.2 allows an attacker to cause a denial of service and may lead to remote code execution.

Exploit prediction

3.30% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

whitesourcesoftware.com https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25946 referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/RobLoach/nconf-toml/blob/8ade08cd1cfb9691ab7cc5c3514cc05c5085918f/index.js#L8 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	nconf-toml	>=0.0.1, <=0.0.2	no fix listed

Affected products

n/a nconf-toml

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

whitesourcesoftware.com /vulnerability-database/CVE-2021-25946
web, exploit, third-party-advisory
github.com /RobLoach/nconf-toml/blob/8ade08cd1cfb9691ab7cc5c3514cc05c5085918f/index.js#L8
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-25946
advisory
github.com /RobLoach/nconf-toml
package

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