CVE-2026-107294
Description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.
How to fix
- pydantic pydantic_ai1.107.2, 2.24.0 or later
- pydantic-ai1.107.2, 2.24.0 or later
- pydantic-ai-slim1.107.2, 2.24.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pydantic pydantic_ai | 1.77.0 ≤ v < 1.107.2, 2.0.0 ≤ v < 2.24.0 | 1.107.2, 2.24.0 |
| pydantic-aiPyPI | 1.77.0 ≤ v < 1.107.2, 2.0.0b1 ≤ v < 2.24.0 | 1.107.2, 2.24.0 |
| pydantic-ai-slimPyPI | 1.77.0 ≤ v < 1.107.2, 2.0.0b1 ≤ v < 2.24.0 | 1.107.2, 2.24.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.