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6.5 Medium

CVE-2026-107287 Pydantic AI is a Python agent framework for building applications and workflows with Generative 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.

Affected products and versions

Product Affected versions Fixed in
pydantic-ai 2.0 2.0.0b1 → < 2.52.0 2.52.0
pydantic-ai 1.77 1.77.0 → < 1.107.7 1.107.7
pydantic-ai-slim 2.0 2.0.0b1 → < 2.52.0 2.52.0
pydantic-ai-slim 1.77 1.77.0 → < 1.107.7 1.107.7

References

Timeline

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Other CVEs of pydantic-ai

The 16 CVEs of pydantic-ai →
CVE-2026-107295 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 7.6 High CVE-2026-107294 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 6.5 Medium CVE-2026-107293 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 2.3 Low CVE-2026-107292 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 6.4 Medium
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