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A critical arbitrary code execution vulnerability (CVE-2026-41635) exists in Apache MINA versions 2.0.0 through 2.0.27, 2.1.0 through 2.1.10, and 2.2.0 through 2.2.5 due to missing class validation in the AbstractIoBuffer.resolveClass() method, potentially allowing attackers to execute arbitrary code on applications using Apache MINA.