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MEDIUM severity

CVE-2014-3743 — marked

MEDIUM

CVE-2014-3743 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in marked. A fix is available for marked — see the affected versions and patch details below.

Multiple Content Injection Vulnerabilities in marked

Also known asGHSA-9cw2-jqp5-7x39
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs77th percentile — riskier than 77% of all scored CVEsHighest risk
0.00%0.74%1.48%2.21%0.4%1.7%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

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.

15Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
markednpm
121.1Mdownloads / week

Description

Versions 0.3.0 and earlier of marked are affected by two cross-site scripting vulnerabilities, even when sanitize: true is set.

The attack vectors for this vulnerability are GFM Codeblocks and JavaScript URLs.

Recommendation

Upgrade to version 0.3.1 or later.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmarkedall versions0.3.1npm install marked@0.3.1

Affected Products

1 product · 1 configurations
Application
markedmarked_project
< 0.3.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update marked to 0.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2014-3743 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Versions 0.3.0 and earlier of `marked` are affected by two cross-site scripting vulnerabilities, even when `sanitize: true` is set. The attack vectors for this vulnerability are GFM Codeblocks and JavaScript URLs. ## Recommendation Upgrade to version 0.3.1 or later.
O3 Security · Impact-Aware SCA

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CVE-2014-3743: marked XSS — Fixed in 0.3.1