CVE-2026-107290Medium· 6.5▾ SunlitPydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback process server-controlled responses with q…
▾ 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
0.4%
Last analysed / modified upstream
0.4% → 0.5%
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback process server-controlled responses with quadratic title extraction, whitespace normalization, and ordered-list numbering. An attacker-controlled page of modest size can therefore block the event loop for an extended period, stalling other agent runs and requests, while unsupported codecs or excessive HTML or JSON nesting can abort an individual run. This issue is fixed in versions 1.107.6 and 2.44.0.
pydantic_ai >= 1.77.0, < 1.107.6pydantic_ai >= 2.0.0, < 2.44.0Upgrade past the affected range:
pydantic_ai 2.44.0Affected packages:
pydantic-ai >= 1.77.0, < 1.107.6pydantic-ai >= 2.0.0b1, < 2.44.0pydantic-ai-slim >= 1.77.0, < 1.107.6pydantic-ai-slim >= 2.0.0b1, < 2.44.0Patched in:
pydantic-ai 1.107.6pydantic-ai 2.44.0pydantic-ai-slim 1.107.6pydantic-ai-slim 2.44.0Connected by shared product, vendor, weakness, or advisory.
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