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MEDIUM severity

CVE-2018-3718 — serve

MEDIUM

CVE-2018-3718 is a medium-severity (CVSS 5.3) CWE-177 vulnerability in serve. 1 public exploit reference exists, so weaponization risk is real. A fix is available for serve — see the affected versions and patch details below.

vercel/serve allows access to restricted files if filename is URL encoded.

Also known asGHSA-5rc4-8qqh-vq7f
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk-0.02%
Lower risk than most CVEs70th percentile — riskier than 70% of all scored CVEsHighest risk
0.00%0.61%1.21%1.82%0.2%1.3%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2018-3718 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

827other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
servenpm
2.3Mdownloads / week

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmserveall versions6.5.2npm install serve@6.5.2

Affected Products

1 product · 1 configurations
Application
servezeit
< 6.5.2
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

serve node module suffers from Improper Handling of URL Encoding by perm…

hackerone.comNVDOct 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for serve, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update serve to 6.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-3718 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a filename is URL encoded.
O3 Security · Impact-Aware SCA

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CVE-2018-3718: serve — Fixed in 6.5.2