Open-weight models provide researchers and developers with accessible foundations for diverse downstream applications. We tested the safety and security postures of eight open-weight large language models (LLMs) to identify vulnerabilities that may impact subsequent fine-tuning and deployment. Using automated adversarial testing, we measured each model's resilience against single-turn and multi-turn prompt injection and jailbreak attacks. Our findings reveal pervasive vulnerabilities across all tested models, with multi-turn attacks achieving success rates between 25.86\% and 92.78\% -- representing a $2\times$ to $10\times$ increase over single-turn baselines. These results underscore a systemic inability of current open-weight models to maintain safety guardrails across extended interactions. We assess that alignment strategies and lab priorities significantly influence resilience: capability-focused models such as Llama 3.3 and Qwen 3 demonstrate higher multi-turn susceptibility, whereas safety-oriented designs such as Google Gemma 3 exhibit more balanced performance. The analysis concludes that open-weight models, while crucial for innovation, pose tangible operational and ethical risks when deployed without layered security controls. These findings are intended to inform practitioners and developers of the potential risks and the value of professional AI security solutions to mitigate exposure. Addressing multi-turn vulnerabilities is essential to ensure the safe, reliable, and responsible deployment of open-weight LLMs in enterprise and public domains. We recommend adopting a security-first design philosophy and layered protections to ensure resilient deployments of open-weight models.

At AIShield, we have had an impressive year of growth and achievement. Our team has consistently demonstrated adaptability and a focus on pivoting when necessary, allowing us to make significant progress in our product, business, and team. To drive this progress, we have implemented several strategic initiatives, including an API-first product, targeting key industries, offering free product trials, hosting and launching our product on AWS, building demos, releasing white paper, enabling free security assessment, deploying defenses across the multi-cloud to edge continuum, and providing reference implementations with a python SDK. These efforts have helped us attract and serve many customers and have laid a strong foundation for our business moving forward. Our focus on AI security has enabled us to develop innovative technology that sets us apart from the competition.