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CVE-2026-107287

6.5 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 7

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 6.5 · pydanticNVD modified 2026-10-14 01:17

Affected (CPE criteria) 2

  • cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*
  • cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*

References 7