CVE-2026-107287Medium· 6.5▾ SunlitPydantic 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 durin…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 10.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
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.
pydantic_ai >= 1.77.0, < 1.107.7pydantic_ai >= 2.0.0, < 2.52.0Upgrade past the affected range:
pydantic_ai 2.52.0Affected packages:
pydantic-ai >= 1.77.0, < 1.107.7pydantic-ai >= 2.0.0b1, < 2.52.0pydantic-ai-slim >= 1.77.0, < 1.107.7pydantic-ai-slim >= 2.0.0b1, < 2.52.0Patched in:
pydantic-ai 1.107.7pydantic-ai 2.52.0pydantic-ai-slim 1.107.7pydantic-ai-slim 2.52.0Connected by shared product, vendor, weakness, or advisory.
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