CVE-2018-3719: mixin-deep node module before 1.3.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability

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HIGH 8.8UPGRADE

CVE-2018-3719 is a high-severity flaw (CVSS 8.8) affecting mixin-deep. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mixin-deep node module before 1.3.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-471, CWE-20
Published	2018-06-07
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: mixin-deep project

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

Am I affected?

Timeline

2018-06-07 02:29 UTCPublished CVE record published
2026-06-17 01:57 UTCUpdated Record last modified

mixin-deep project mixin-deep UPGRADE

Affected: < 1.3.1

Fixed in: 1.3.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls mixin-deep

2. UPGRADE to 1.3.1

npm install mixin-deep@">=1.3.1"

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-2018-3719?

mixin-deep: upgrade to 1.3.1. Exact commands for each OS are on this page.

Is CVE-2018-3719 being exploited?

CVE-2018-3719 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-2018-3719 affect?

CVE-2018-3719 affects mixin-deep. Severity is high (CVSS 8.8). mixin-deep node module before 1.3.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an exis

How urgent is CVE-2018-3719?

Priority 56/100. High severity; Public exploit reference

Related CVEs

CVE-2019-10746 CRITICAL 9.8 UPGRADE MITIGATE mixin-deep is vulnerable to Prototype Pollution in versions before 1.3.2 and version 2.0.0

References

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