Release date: 2026-11-04.

Build IDs: Service 15.4.0.577, Client 15.4.0.1665.

Bugfixes

• Updated the included OpenSSL libraries to version 3.5.9.
• SMTP Listener: Limited decoded message bodies to 10 MiB and DATA reception to 60 seconds; oversized or unfinished submissions are rejected.
• RELP Listener: Bounded diagnostic handling during ultra-verbose logging to reduce the risk of service interruptions.
• SETP: Hardened message handling against malformed and deeply nested input.
• Syslog Listener: Bounded header parsing to prevent malformed messages from interrupting service availability.

Download

The versioned installer is MonitorWare Agent 15.4a, 91 MB. SHA-256: e754f1be9c43adce9bdcf8687d4b4805c9e9599606b47d96046ce31f366bf9cf.

The announcement is the MonitorWare Agent 15.4a news release.