GHSA-gqgv-6jq5-jjj9 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in qs. O3 Security confirms whether GHSA-gqgv-6jq5-jjj9 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Prototype Pollution Protection Bypass in qs
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.
qsnpmDescription
Affected version of qs are vulnerable to Prototype Pollution because it is possible to bypass the protection. The qs.parse function fails to properly prevent an object's prototype to be altered when parsing arbitrary input. Input containing [ or ] may bypass the prototype pollution protection and alter the Object prototype. This allows attackers to override properties that will exist in all objects, which may lead to Denial of Service or Remote Code Execution in specific circumstances.
Recommendation
Upgrade to 6.0.4, 6.1.2, 6.2.3, 6.3.2 or later.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | qs | all versions | 6.0.4 |
| 📦npm | qs | ≥ 6.1.0&&< 6.1.2 | 6.1.2 |
| 📦npm | qs | ≥ 6.2.0&&< 6.2.3 | 6.2.3 |
| 📦npm | qs | ≥ 6.3.0&&< 6.3.2 | 6.3.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for qs. 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 qs to 6.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gqgv-6jq5-jjj9 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-gqgv-6jq5-jjj9 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-gqgv-6jq5-jjj9. 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-gqgv-6jq5-jjj9 in your dependencies?
O3 detects GHSA-gqgv-6jq5-jjj9 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.