GHSA-f9cm-qmx5-m98h
HIGHGHSA-f9cm-qmx5-m98h is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in merge. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-f9cm-qmx5-m98h is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Prototype Pollution in merge
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.
mergenpmDescription
Versions of merge before 1.2.1 are vulnerable to prototype pollution. The merge.recursive function can be tricked into adding or modifying properties of the Object prototype.
Recommendation
Update to version 1.2.1 or later.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | merge | all versions | 1.2.1 |
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 merge. 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.
Fix
Update merge to 1.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f9cm-qmx5-m98h is resolved across your whole dependency graph.
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.
How O3 protects you
O3 pinpoints whether GHSA-f9cm-qmx5-m98h 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 GHSA-f9cm-qmx5-m98h. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-f9cm-qmx5-m98h in your dependencies?
O3 detects GHSA-f9cm-qmx5-m98h across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.