Description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 0.3.4 until 1.107.4 and 2.27.1, OpenTelemetry instrumentation configured with InstrumentationSettings(include_content=False) can export retry prompts outside tool calls in gen_ai.input.messages and pydantic_ai.all_messages. Agents using NativeOutput, PromptedOutput, or output validators on text output can therefore disclose validation feedback, including invalid model values quoted by that feedback, to readers of the telemetry backend. Tool-call retries and deployments that do not use include_content=False are not affected by this specific path. This issue is fixed in versions 1.107.4 and 2.27.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| pydantic | pydantic-ai | >= 0.3.4, < 1.107.4, >= 2.0.0b1, < 2.27.1 | — |
| pydantic | pydantic-ai-slim | >= 0.3.4, < 1.107.4, >= 2.0.0b1, < 2.27.1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pydantic-ai | >= 0.3.4, < 1.107.4 | 1.107.4 | GHSA-3gh4-cghq-f8v4 |
| PyPI | pydantic-ai | >= 2.0.0b1, < 2.27.1 | 2.27.1 | GHSA-3gh4-cghq-f8v4 |
| PyPI | pydantic-ai | >= 0.3.4, < 1.107.4 · >= 2.0.0b1, < 2.27.1 | 1.107.4, 2.27.1 | PYSEC-2026-4274 |
| PyPI | pydantic-ai-slim | >= 0.3.4, < 1.107.4 | 1.107.4 | GHSA-3gh4-cghq-f8v4 |
| PyPI | pydantic-ai-slim | >= 2.0.0b1, < 2.27.1 | 2.27.1 | GHSA-3gh4-cghq-f8v4 |
| PyPI | pydantic-ai-slim | >= 0.3.4, < 1.107.4 · >= 2.0.0b1, < 2.27.1 | 1.107.4, 2.27.1 | PYSEC-2026-4283 |