CVE-2026-107286

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 2.10.0 until 2.53.0, streamed requests made through ConcurrencyLimitedModel or limitmodelconcurrency can retain shared concurrency slots because anyio.CapacityLimiter associates an acquired sl...

CVE-2026-107286 Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 2.10.0 until 2.53.0, streamed requests made through ConcurrencyLimitedModel or limitmodelconcurrency can retain shared concurrency slots because anyio.CapacityLimiter associates an acquired sl...

CVE-2026-107286

The Pydantic AI Python agent framework versions 2.10.0 through 2.52.0 are vulnerable to a denial of service (DoS) condition. The root cause is that streamed requests made through ConcurrencyLimitedModel or limit_model_concurrency can retain shared concurrency slots. This occurs because anyio.Capa...