GHSA-9299-c6m4-mjhc is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in org.eclipse.jetty:jetty-server. O3 Security confirms whether GHSA-9299-c6m4-mjhc is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Eclipse Jetty: DoS attack triggering OutOfMemory with 100-Continue requests
Real-World Exposure
org.eclipse.jetty:jetty-server☕org.eclipse.jetty:jetty-serverReal-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
Impact
The original report:
Server handling of 100-Continue requests can lead to memory leak that can be abused to cause a Denial of Service state.
After investigation, turns out that every request that has a body, but reading the body may end up in reading 0 bytes, leaks a buffer. This is particularly the case for 100-Continue, but any request where the network is slow can leak.
Affected Versions
- Jetty 11.0.0-11.0.22 (EOL)
- Jetty 10.0.0-10.0.22 (EOL)
Patched Versions
- Jetty 11.0.23
- Jetty 10.0.23
Patches
https://github.com/jetty/jetty.project/pull/12156
Workarounds
No workarounds.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.eclipse.jetty:jetty-server | ≥ 10.0.7&&< 10.0.23 | 10.0.23 |
| ☕Maven | org.eclipse.jetty:jetty-server | ≥ 11.0.7&&< 11.0.23 | 11.0.23 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.eclipse.jetty:jetty-server. 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 org.eclipse.jetty:jetty-server to 10.0.23 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9299-c6m4-mjhc 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-9299-c6m4-mjhc 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-9299-c6m4-mjhc. 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-9299-c6m4-mjhc in your dependencies?
O3 detects GHSA-9299-c6m4-mjhc across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.