CVE-2026-65975

CVE-2026-65975 affects Pydantic AI AG-UI Adapter (AG-UI via Agent.to_ag_ui()/AGUIAdapter and Vercel AI via VercelAIAdapter) in Pydantic AI versions 1.88.0–1.107.0 and 2.0.0b1–2.4.x. The bug arises because sanitize_messages uses a stripping index computed before sanitization, so when a trailing cl...

CVE-2026-65975 Pydantic AI AG-UI Adapter: A dangling client-submitted tool call can execute when a trailing message is dropped during `sanitize_messages`

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. In versions 1.88.0 up to but not including 1.107.1 and 2.0.0b1 up to but not including 2.5.0, the UI adapters AG-UI via Agent.toagui/AGUIAdapter, and Vercel AI via VercelAIAdapter use...