CVE-2018-14731: An issue was discovered in HMRServer.js in Parcel parcel-bundler

This week

HIGH 7.5REMOTEMITIGATE

CVE-2018-14731 is a high-severity flaw (CVSS 7.5) affecting parcel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1 connection (with a random TCP port number) from any origin. The random port number can be found by connecting to http://127.0.0.1 and r

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-200
Published	2018-09-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: parceljs

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

Am I affected?

Timeline

2018-09-21 17:29 UTCPublished CVE record published
2026-06-17 01:41 UTCUpdated Record last modified

parceljs parcel MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy parcel || rpm -q parcel || parcel --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2018-14731?

parcel: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-14731 being exploited?

CVE-2018-14731 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-2018-14731 affect?

CVE-2018-14731 affects parcel. Severity is high (CVSS 7.5). An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can

How urgent is CVE-2018-14731?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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