CVE-2020-7713 is a critical-severity (CVSS 9.8) CWE-1321 vulnerability in arr-flatten-unflatten. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether CVE-2020-7713 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Prototype Pollution in arr-flatten-unflatten
Real-World Exposure
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.
arr-flatten-unflattennpmDescription
All versions of package arr-flatten-unflatten up to and including version 1.1.4 are vulnerable to Prototype Pollution via the constructor.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | arr-flatten-unflatten | all versions | No fix |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for arr-flatten-unflatten. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of arr-flatten-unflatten has shipped for CVE-2020-7713 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
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.
How O3 protects you
O3 pinpoints whether CVE-2020-7713 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2020-7713. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2020-7713 in your dependencies?
O3 detects CVE-2020-7713 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.