CVE-2022-21803: This affects the package nconf before 0.11.4

This week

HIGH 7.3REMOTEUPGRADE

CVE-2022-21803 is a high-severity flaw (CVSS 7.3) affecting nconf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This affects the package nconf before 0.11.4. When using the memory engine, it is possible to store a nested JSON representation of the configuration. The .set() function, that is responsible for setting the configuration properties, is vulnerable to Prototype Pollution. By providing a crafted property, it is possible to modify the properties on the Object.prototype.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-1321
Published	2022-04-12
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: nconf project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-12 16:15 UTCPublished CVE record published
2026-06-17 04:27 UTCUpdated Record last modified

nconf project nconf UPGRADE

Affected: < 0.11.4

Fixed in: 0.11.4

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls nconf

2. UPGRADE to 0.11.4

npm install nconf@">=0.11.4"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-21803?

nconf: upgrade to 0.11.4. Exact commands for each OS are on this page.

Is CVE-2022-21803 being exploited?

CVE-2022-21803 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-21803 affect?

CVE-2022-21803 affects nconf. Severity is high (CVSS 7.3). This affects the package nconf before 0.11.4. When using the memory engine, it is possible to store a nested JSON representation of the configuration. The .set() function, that is responsible for setting the configuration properties, is vul

How urgent is CVE-2022-21803?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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