GHSA-xhfc-gr8f-ffwc
HIGHGHSA-xhfc-gr8f-ffwc is a high-severity (CVSS 7.5) CWE-19 vulnerability in System.Private.Uri. O3 Security confirms whether GHSA-xhfc-gr8f-ffwc is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Denial of service in ASP.NET Core
Blast Radius
System.Private.UriReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0820, CVE-2019-0981.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | System.Private.Uri | ≥ 4.3.0&&< 4.3.2 | 4.3.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for System.Private.Uri. 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 System.Private.Uri to 4.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xhfc-gr8f-ffwc 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-xhfc-gr8f-ffwc 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-xhfc-gr8f-ffwc. 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-xhfc-gr8f-ffwc in your dependencies?
O3 detects GHSA-xhfc-gr8f-ffwc across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.