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CRITICAL severity

CVE-2020-7673 — node-extend

CRITICAL

CVE-2020-7673 is a critical-severity (CVSS 9.8) Code Injection vulnerability in node-extend. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Code Injection in node-extend

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Sep 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2020-7673 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 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.

16other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
node-extendnpm
122downloads / week

Description

node-extend through 0.2.0 is vulnerable to Arbitrary Code Execution. User input provided to the argument A of extend function(A,B,as,isAargs) located within lib/extend.js is executed by the eval function, resulting in code execution.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
📦npmnode-extendall versionsNo fix

Affected Products

1 product · 1 configurations
Application
node-extendnode-extend_project
≤ 0.2.0
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.

node-extend through 0.2.0 is vulnerable to Arbitrary Code Execution. Use…

snyk.ioNVDJul 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    No patched version of node-extend has shipped for CVE-2020-7673 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    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

node-extend through 0.2.0 is vulnerable to Arbitrary Code Execution. User input provided to the argument `A` of `extend` function`(A,B,as,isAargs)` located within `lib/extend.js` is executed by the `eval` function, resulting in code execution.
O3 Security · Impact-Aware SCA

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CVE-2020-7673: node-extend: Code Injection