CVE-2026-107293: Pydantic Pydantic-Ai

Low severity, CVSS 2.3. EPSS: 0.3% 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 1.107.4 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

• Pydantic Pydantic-Ai: from 0.3.4, before 1.107.4 (fixed in 1.107.4); from 2.0.0b1, before 2.27.1 (fixed in 2.27.1)
• Pydantic Pydantic-Ai-Slim: from 0.3.4, before 1.107.4 (fixed in 1.107.4); from 2.0.0b1, before 2.27.1 (fixed in 2.27.1)

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