CVE-2026-107287

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.

• CWE-400
• CWE-407

• https://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180c
• https://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545
• https://github.com/pydantic/pydantic-ai/pull/8984
• https://github.com/pydantic/pydantic-ai/pull/8985
• https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7
• https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0
• https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cw

Published

Oct 8, 2026

Last Modified

Oct 8, 2026

Status

Received

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