GHSA-7xx3-m584-x994
MEDIUMGHSA-7xx3-m584-x994 is a medium-severity (CVSS 5.3) CWE-770 vulnerability in puma. O3 Security confirms whether GHSA-7xx3-m584-x994 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack
Real-World Exposure
puma💎pumaReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
Keepalive thread overload/DoS
Impact
A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack.
If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough.
Patches
This vulnerability is patched in Puma 4.3.1 and 3.12.2.
Workarounds
Reverse proxies in front of Puma could be configured to always allow less than X keepalive connections to a Puma cluster or process, where X is the number of threads configured in Puma's thread pool.
For more information
If you have any questions or comments about this advisory:
- Open an issue at puma.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | puma | all versions | 3.12.2 |
| 💎RubyGems | puma | ≥ 4.0.0&&< 4.3.1 | 4.3.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for puma. 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 puma to 3.12.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7xx3-m584-x994 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-7xx3-m584-x994 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-7xx3-m584-x994. 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-7xx3-m584-x994 in your dependencies?
O3 detects GHSA-7xx3-m584-x994 across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.