What is CVE-2020-35149?

CVE-2020-35149 is a medium-severity vulnerability in Mquery Project. CVSS score: 5.3/10. Published 2020-12-11.

How severe is CVE-2020-35149?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mquery Project

CVE-2020-35149

lib/utils.js in mquery before 3.2.3 allows a pollution attack because a special property (e.g., __proto__) can be copied during a merge or clone operation.

Published 2020-12-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

Mquery Project

References

github.com/aheckmann/mquery/commit/792e69fd0a7281a0300be5cade5a6d7c1d468ad4 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-35149?: CVE-2020-35149 is a medium-severity vulnerability in Mquery Project. CVSS score: 5.3/10. Published 2020-12-11.
How severe is CVE-2020-35149?: Medium severity. CVSS v3 base score is 5.3 out of 10.