Pydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans include content when `include_content=False`

Summary

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 0.3.4 until 1.107.6 and 2.44.0, OpenTelemetry instrumentation configured with InstrumentationSettings(include_content=False) can still export sensitive agent content through exception.message and exception.stacktrace events, error status descriptions, and model_request_parameters containing instructions or the prompted_output_template. The exposed data is available to readers of the configured telemetry backend and can include tool feedback, provider error bodies, runtime instructions, and structured-output templates even though message attributes are redacted. This issue does not grant new access to agent data, and deployments that do not use include_content=False are not affected by the setting bypass. This issue is fixed in versions 1.107.6 and 2.44.0.

Timeline

1. Oct 8, 2026, 4:22 PM UTCCVE published
2. Oct 8, 2026, 5:25 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 8, 2026, 5:25 PM UTCRecord last updated

Affected versions

• pydantic pydantic-ai

  From 0.3.4 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0

• pydantic pydantic-ai-slim

  From 0.3.4 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0

• pydantic-aiPyPI

  From 0.3.4 · fixed in 1.107.6

• pydantic-aiPyPI

  From 2.0.0b1 · fixed in 2.44.0

• pydantic-ai-slimPyPI

  From 0.3.4 · fixed in 1.107.6

• pydantic-ai-slimPyPI

  From 2.0.0b1 · fixed in 2.44.0

• pydantic-aiPyPI

  From 0.3.4 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0

• pydantic-ai-slimPyPI

  From 0.3.4 · fixed in 1.107.6; From 2.0.0b1 · fixed in 2.44.0

References 13