This three volume set, LNCS 16775–16777, constitutes the revised selected papers of the 26th International Conference on Software Quality, Reliability, and Security, QRS 2026, held in Florence, Italy, during July 22–25, 2026.

The 71 full papers and 32 short papers included in these volumes were carefully reviewed and selected out of 278 submissions. The papers cover the following topical sections: 

Part I: AI and LLM-Driven Software Engineering; Cyber-Physical, Autonomous, and Safety-Critical Systems; and Requirements, Specifications, Formal Methods, and Model-Based Engineering;

Part II: Software Testing, Fault Localization, and Program Analysis; Software Architecture, Maintenance, DevOps, and Ecosystems; 

Part III: Cybersecurity, Vulnerability Detection, and Privacy; and AI/ML Quality, Data, and Intelligent Applications.