CVE-2018-3718: serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a fi

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MEDIUM 5.3REMOTEUPGRADE

CVE-2018-3718 is a medium-severity flaw (CVSS 5.3) affecting serve. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a filename is URL encoded.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-177
Published	2018-06-07
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: zeit

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

zeit serve UPGRADE

Affected: < 6.5.2

Fixed in: 6.5.2

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls serve

2. UPGRADE to 6.5.2

npm install serve@">=6.5.2"

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-2018-3718?

serve: upgrade to 6.5.2. Exact commands for each OS are on this page.

Is CVE-2018-3718 being exploited?

CVE-2018-3718 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-2018-3718 affect?

CVE-2018-3718 affects serve. Severity is medium (CVSS 5.3). serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a filename is URL encoded.

How urgent is CVE-2018-3718?

Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-5417 HIGH 7.5 UPGRADE A path traversal vulnerability in serve npm package version 7.0.1 allows the attackers to read content of arbi
CVE-2019-5415 HIGH 7.5 DOWNGRADE A bug in handling the ignore files and directories feature in serve 6.5.3 allows an attacker to read a file or
CVE-2018-3809 MEDIUM 5.3 DOWNGRADE Information exposure through directory listings in serve 6.5.3 allows directory listing and file access even w
CVE-2018-3712 MEDIUM 6.5 UPGRADE serve node module before 6.4.9 suffers from a Path Traversal vulnerability due to not handling %2e (.) and %2f

References

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