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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
pydantic pydantic-ai
>= 1.77.0, < 1.107.7affected>= 2.0.0b1, < 2.52.0affected
pydantic pydantic-ai-slim
>= 1.77.0, < 1.107.7affected>= 2.0.0b1, < 2.52.0affected
References
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cw ↗
- https://github.com/pydantic/pydantic-ai/pull/8984 ↗
- https://github.com/pydantic/pydantic-ai/pull/8985 ↗
- https://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180c ↗
- https://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545 ↗
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7 ↗
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0 ↗