GHSA-r9w3-g83q-m6hq
HIGHGHSA-r9w3-g83q-m6hq is a high-severity (CVSS 8.1) CWE-915 vulnerability in deepmerge-ts. O3 Security confirms whether GHSA-r9w3-g83q-m6hq is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Prototype Pollution in deepmerge-ts
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
deepmerge-tsnpmDescription
deepmerge-ts is used to merge 2 or more objects respecting type information. deepmerge-ts is vulnerable to Prototype Pollution via file deepmerge.ts, function defaultMergeRecords(). A fix was released in version 4.0.2. Currently, there is no known workaround.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | deepmerge-ts | all versions | 4.0.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for deepmerge-ts. 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 deepmerge-ts to 4.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r9w3-g83q-m6hq 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-r9w3-g83q-m6hq 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-r9w3-g83q-m6hq. 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-r9w3-g83q-m6hq in your dependencies?
O3 detects GHSA-r9w3-g83q-m6hq across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.