CVE-2025-2240
HIGHCVE-2025-2240 is a high-severity (CVSS 7.5) CWE-1325 vulnerability in io.smallrye:smallrye-fault-tolerance-core. O3 Security confirms whether CVE-2025-2240 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Smallrye-fault-tolerance: smallrye fault tolerance
Blast Radius
io.smallrye:smallrye-fault-tolerance-core☕io.smallrye:smallrye-fault-tolerance-coreReal-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
A flaw was found in Smallrye, where smallrye-fault-tolerance is vulnerable to an out-of-memory (OOM) issue. This vulnerability is externally triggered when calling the metrics URI. Every call creates a new object within meterMap and may lead to a denial of service (DoS) issue.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | io.smallrye:smallrye-fault-tolerance-core | ≥ 6.3.0&&< 6.4.2 | 6.4.2 |
| ☕Maven | io.smallrye:smallrye-fault-tolerance-core | ≥ 6.5.0&&< 6.9.0 | 6.9.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.smallrye:smallrye-fault-tolerance-core. 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.smallrye:smallrye-fault-tolerance-core to 6.4.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-2240 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 CVE-2025-2240 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 CVE-2025-2240. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2025-2240 in your dependencies?
O3 detects CVE-2025-2240 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.