CVE-2026-107287: CWE-400: Uncontrolled Resource Consumption in pydantic pydantic-ai
Description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.7 and 2.52.0, the local web_fetch_tool and the WebFetch local fallback can consume excessive CPU and memory during HTML-to-Markdown conversion of attacker-controlled HTML containing deeply nested block elements. Conversion repeatedly reprocesses accumulated text and can greatly expand intermediate output before the returned-content limit is applied, allowing a model-directed fetch to delay other work in the process. Provider-native web fetching is not affected. This issue is fixed in versions 1.107.7 and 2.52.0.
CVSS v3.1
Score 6.5medium
Affected software
pydantic
pydantic-ai
pydantic
pydantic-ai-slim
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-07T15:53:23.586Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac7be8a2cdf04f65627bc31
Added to database: 10/08/2026, 16:02:18 UTC
Last updated: 10/08/2026, 16:02:18 UTC
Views: 1
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