CVE-2026-107291: Pydantic Pydantic-Ai

Low severity, CVSS 2.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Pydantic Pydantic-Ai: from 0.3.4, before 1.107.6 (fixed in 1.107.6); from 2.0.0b1, before 2.44.0 (fixed in 2.44.0)
• Pydantic Pydantic-Ai-Slim: from 0.3.4, before 1.107.6 (fixed in 1.107.6); from 2.0.0b1, before 2.44.0 (fixed in 2.44.0)

Published 2026-10-08. Last modified 2026-10-08.