CVE-2022-21190

Name: CVE-2022-21190
Creator: NVD / NIST
Published: 2022-05-13T20:15:08.013+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.72%

Last modified Jun 17, 2026

CVE-2022-21190 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. This affects the package convict before 6.2.3. This is a bypass of [CVE-2022-22143](https://security.snyk.io/vuln/SNYK-JS-CONVICT-2340604). EPSS estimates a 3.72% chance of exploitation in the next 30 days.

Description

This affects the package convict before 6.2.3. This is a bypass of [CVE-2022-22143](https://security.snyk.io/vuln/SNYK-JS-CONVICT-2340604). The [fix](https://github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880) introduced, relies on the startsWith method and does not prevent the vulnerability: before splitting the path, it checks if it starts with __proto__ or this.constructor.prototype. To bypass this check it's possible to prepend the dangerous paths with any string value followed by a dot, like for example foo.__proto__ or foo.this.constructor.prototype.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.72%

88.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1321

Affected Software

Vendor	Product	Versions
Mozilla	Convict	< 6.2.3

References

https://gist.github.com/dellalibera/cebce20e51410acebff1f46afdc89808Exploit, Third Party Advisory
https://github.com/mozilla/node-convict/blob/3b86be087d8f14681a9c889d45da7fe3ad9cd880/packages/convict/src/main.js%23L571Broken Link, Patch, Third Party Advisory
https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md%23623---2022-05-07Broken Link, Release Notes, Tool Signature
https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75Patch, Tool Signature
https://snyk.io/vuln/SNYK-JS-CONVICT-2774757Exploit, Third Party Advisory
https://gist.github.com/dellalibera/cebce20e51410acebff1f46afdc89808Exploit, Third Party Advisory
https://github.com/mozilla/node-convict/blob/3b86be087d8f14681a9c889d45da7fe3ad9cd880/packages/convict/src/main.js%23L571Broken Link, Patch, Third Party Advisory
https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md%23623---2022-05-07Broken Link, Release Notes, Tool Signature
https://github.com/mozilla/node-convict/commit/1ea0ab19c5208f66509e1c43b0d0f21c1fd29b75Patch, Tool Signature
https://snyk.io/vuln/SNYK-JS-CONVICT-2774757Exploit, Third Party Advisory

Timeline

Published: May 13, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21190?

How severe is CVE-2022-21190?

CVE-2022-21190 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.72% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21190?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21190?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST