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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| org.eclipse.paho:org.eclipse.paho.client.mqttv3 | maven | < 1.2.1 | 1.2.1 |
The vulnerability stems from unverified HostnameVerifier results in SSL handshake handling. Both SSLNetworkModule.start() methods in MQTTv3 and MQTTv5 implementations called hostnameVerifier.verify() without checking its return value, allowing invalid SSL sessions to proceed. The patches add explicit result checking and error handling. These start() methods would appear in runtime profiles during TLS connection establishment when hostname validation occurs.
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