This book constitutes the refereed proceedings of the 23rd International Conference on Detection of Intrusions and Malware, and Vulnerability Assessment, DIMVA 2026, held in Chania, Greece, during July 1-3, 2026.

The 33 revised full papers and 10 poster papers presented in these proceedings were carefully reviewed and selected from 151 submissions. The papers are organized in the following topical sections:

Part I: IoT & Embedded Security; Platform Security & Hardware Vulnerabilities; Vulnerability Detection & Fuzzing; Systems Security & Microarchitectural Attacks; and AI for Security & Robustness;

Part II: Software & Platform Security; Timing Attacks and System-Level Defenses; Malware Analysis & Detection; Network & Communication Security; and Security Operations & Incident Response.