Directory Traversal in serve

published 2018-06-07 8 y ago modified 2026-06-17 4 mo ago also GHSA-q2qh-cgc2-qhr3 , EUVD-2018-0308

cvss: 6.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits: 0; none known

serve node module before 6.4.9 suffers from a Path Traversal vulnerability due to not handling %2e (.) and %2f (/) and allowing them in paths, which allows a malicious user to view the contents of any directory with known path.

Patch / fix

fixed in 2 links 2

npm serve 6.4.9
zeit serve 6.4.9

github.com/vercel/serve@6adad68 commit
github.com/zeit/serve#316 pull request

Exploit prediction

1.79% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/307666 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:P/I:N/A:N
GitHub	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	serve	<6.4.9	6.4.9

Affected products

HackerOne serve node module

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

github.com /zeit/serve/pull/316
web, vendor-advisory
github.com /vercel/serve/commit/6adad6881c61991da61ebc857857c53409544575
web
hackerone.com /reports/307666
web, exploit, technical-description
nvd.nist.gov /vuln/detail/CVE-2018-3712
advisory
github.com /vercel/serve
package

Sources

CVE List CVE-2018-3712
GitHub Advisory GHSA-q2qh-cgc2-qhr3
NVD CVE-2018-3712

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary