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CRITICAL severity

Code Injection in morganGHSA-gwg9-rgvj-4h5j

CRITICAL

GHSA-gwg9-rgvj-4h5j is a critical-severity (CVSS 9.8) Code Injection vulnerability in morgan. 1 public exploit reference exists, so weaponization risk is real. A fix is available for morgan — see the affected versions and patch details below.

Also known asCVE-2019-5413
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
1.45%2.27%3.08%3.90%1.9%3.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-gwg9-rgvj-4h5j 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.

10Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
morgannpm
8.4Mdownloads / week

Description

Verisons of morgan before 1.9.1 are vulnerable to code injection when user input is allowed into the filter or combined with a prototype pollution attack.

Recommendation

Update to version 1.9.1 or later.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmorganall versions1.9.1npm install morgan@1.9.1

Affected Products

1 product · 1 configurations
Application
morganmorgan_project
< 1.9.1
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.

An attacker can use the format parameter to inject arbitrary commands in…

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 morgan, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update morgan to 1.9.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gwg9-rgvj-4h5j is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

Verisons of `morgan` before 1.9.1 are vulnerable to code injection when user input is allowed into the filter or combined with a prototype pollution attack. ## Recommendation Update to version 1.9.1 or later.
O3 Security · Impact-Aware SCA

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Code Injection in morgan (Critical 9.8)