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.