CVE-2026-107295
Description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 1.107.4 and 2.28.0, the Agent.to_web() and clai web development chat endpoint has missing request content-type validation. A website visited by a developer can submit a browser-compatible request to a loopback-hosted chat server, causing the served agent to run and execute tools with the privileges and credentials of the local process; client-relayed approval decisions also leave requires_approval=True tools exposed. Binding to localhost does not prevent a browser page from reaching the loopback address. This issue is fixed in versions 1.107.4 and 2.28.0.
How to fix
- pydantic pydantic_ai1.107.4, 2.28.0 or later
- pydantic-ai1.107.4, 2.28.0 or later
- pydantic-ai-slim1.107.4, 2.28.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pydantic pydantic_ai | 1.34.0 ≤ v < 1.107.4, 2.0.0 ≤ v < 2.28.0 | 1.107.4, 2.28.0 |
| pydantic-aiPyPI | 1.34.0 ≤ v < 1.107.4, 2.0.0b1 ≤ v < 2.28.0 | 1.107.4, 2.28.0 |
| pydantic-ai-slimPyPI | 1.34.0 ≤ v < 1.107.4, 2.0.0b1 ≤ v < 2.28.0 | 1.107.4, 2.28.0 |
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Attack Surface Management
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