CVE-2018-3753: The utilities function in all versions <= 1.0.0 of the merge-objects node module can be tricked into modifying

Q: How urgent is CVE-2018-3753?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-3753 is a critical-severity flaw (CVSS 9.8) affecting merge-object. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The utilities function in all versions <= 1.0.0 of the merge-objects node module can be tricked into modifying the prototype of Object when the attacker can control part of the structure passed to this function. This can let an attacker add or modify existing properties that will exist on all objects.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-07-03
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: merge-object project

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

Am I affected?

Timeline

2018-07-03 21:29 UTCPublished CVE record published
2026-06-17 01:57 UTCUpdated Record last modified

merge-object project merge-object UPGRADE

Affected: <= 1.0.0

Fixed in: newer than 1.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls merge-object

2. UPGRADE to newer than 1.0.0

npm install merge-object@">1.0.0"

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-2018-3753?

merge-object: upgrade to newer than 1.0.0. Exact commands for each OS are on this page.

Is CVE-2018-3753 being exploited?

CVE-2018-3753 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-2018-3753 affect?

CVE-2018-3753 affects merge-object. Severity is critical (CVSS 9.8). The utilities function in all versions <= 1.0.0 of the merge-objects node module can be tricked into modifying the prototype of Object when the attacker can control part of the structure passed to this function. This can let an attacker add

How urgent is CVE-2018-3753?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs