Code Injection in mquery

published 2020-12-11 5 y ago modified 2026-06-17 4 mo ago also GHSA-45q2-34rf-mr94 , EUVD-2020-1478

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 links 1

npm mquery 3.2.3
mquery_project mquery 3.2.3

github.com/aheckmann/mquery@792e69f commit

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-35149 updated 2025-11-21 cvss 4.3

mquery: Code injection via merge or clone operation

Red Hat Advanced Cluster Management for Kubernetes 2.1 for RHEL 8 rhacm2/acm-must-gather-rhel8 v2.1.6-6
fixed: vendor fix RHSA-2021:1369

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	mquery	<3.2.3	3.2.3

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

github.com /aheckmann/mquery/commit/792e69fd0a7281a0300be5cade5a6d7c1d468ad4
web, patch, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-35149
advisory

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