What is CVE-2022-22143?

CVE-2022-22143 is a high-severity vulnerability in Mozilla Convict, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2022-05-01.

How severe is CVE-2022-22143?

High severity. CVSS v3 base score is 7.5 out of 10.

Prototype Pollution in Mozilla Convict

CVE-2022-22143

The package convict before 6.2.2 are vulnerable to Prototype Pollution via the convict function due to missing validation of parentKey. **Note:** This vulnerability derives from an incomplete fix of another [vulnerability](https://security.snyk.io/vuln/SNYK-JS-CONVICT-1062508)

Vulnerability class: Prototype Pollution

Published 2022-05-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.7th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.022 · change: +0.000

Affected products

Mozilla Convict
Convict — versions unspecified

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

snyk.io/vuln/SNYK-JS-CONVICT-2340604 (Exploit, Patch, Third Party Advisory)
github.com/mozilla/node-convict/blob/5eb1314f85346760a3c31cb14510f2f0af11d0d3/p… (Broken Link)
github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-22143?: CVE-2022-22143 is a high-severity vulnerability in Mozilla Convict, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2022-05-01.
How severe is CVE-2022-22143?: High severity. CVSS v3 base score is 7.5 out of 10.