CVE-2018-16461: A command injection vulnerability in libnmapp package for versions <0.4.16 allows arbitrary commands to be exe

Q: How urgent is CVE-2018-16461?

Priority 67/100. Critical severity; EPSS top 10%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-16461 is a critical-severity flaw (CVSS 9.8) affecting libnmap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A command injection vulnerability in libnmapp package for versions <0.4.16 allows arbitrary commands to be executed via arguments to the range options.

Why this priority

Critical severity
EPSS top 10%: very likely to be exploited
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	3.9% (top 10%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2018-10-30
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: libnmap project

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

Am I affected?

Timeline

2018-10-30 21:29 UTCPublished CVE record published
2026-06-17 01:44 UTCUpdated Record last modified

libnmap project libnmap UPGRADE

Affected: < 0.4.16

Fixed in: 0.4.16

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls libnmap

2. UPGRADE to 0.4.16

npm install libnmap@">=0.4.16"

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-2018-16461?

libnmap: upgrade to 0.4.16. Exact commands for each OS are on this page.

Is CVE-2018-16461 being exploited?

CVE-2018-16461 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-2018-16461 affect?

CVE-2018-16461 affects libnmap. Severity is critical (CVSS 9.8). A command injection vulnerability in libnmapp package for versions <0.4.16 allows arbitrary commands to be executed via arguments to the range options.

How urgent is CVE-2018-16461?

Priority 67/100. Critical severity; EPSS top 10%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-1010017 HIGH 7.5 UPGRADE libnmap < v0.6.3 is affected by: XML Injection

References

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