GHSA-hp5x-rqf7-43vf
HIGHGHSA-hp5x-rqf7-43vf is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in io.projectreactor.netty:reactor-netty-http. O3 Security confirms whether GHSA-hp5x-rqf7-43vf is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Improper Handling of Exceptional Conditions and Improper Input Validation in Reactor Netty
Real-World Exposure
io.projectreactor.netty:reactor-netty-httpReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Reactor Netty HttpServer, versions 0.9.3 and 0.9.4, is exposed to a URISyntaxException that causes the connection to be closed prematurely instead of producing a 400 response.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | io.projectreactor.netty:reactor-netty-http | ≥ 0.9.3&&< 0.9.5 | 0.9.5 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.projectreactor.netty:reactor-netty-http. 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 io.projectreactor.netty:reactor-netty-http to 0.9.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hp5x-rqf7-43vf 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-hp5x-rqf7-43vf 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-hp5x-rqf7-43vf. 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-hp5x-rqf7-43vf in your dependencies?
O3 detects GHSA-hp5x-rqf7-43vf across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.