🛡️ Sentinel: [CRITICAL/HIGH] Fix OverflowError thread crash vulnerability

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Application crashes and potential DoS due to OverflowError when untrusted input containing Infinity or NaN is parsed (e.g., from JSON) and subsequently converted to an integer using int(). The thread pool would crash because unhandled exceptions in ThreadPoolExecutor workers bubble up.
🎯 Impact: Denial of Service (DoS) vulnerability. By providing Infinity for the timeout via JSON or an API endpoint feeding this script, an attacker could immediately crash the underlying scanning worker thread pools.
🔧 Fix: Added explicit catch for OverflowError alongside ValueError and TypeError when parsing timeout within is_reachable.
✅ Verification: Ran python3 -m unittest test_testping1.py with 2 new unit tests specifically testing float('inf') and float('-inf') values for timeout, verifying they are gracefully blocked.

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PR created automatically by Jules for task 4475240439618510007 started by @ManupaKDU

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