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CVE-2026-107287

CVE-2026-107287 · Pydantic AI: Excessive resource use when local web fetching converts nested HTML

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.5 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • pydantic-ai

    Versions
    • >= 1.77.0, < 1.107.7: Affected
    • >= 2.0.0b1, < 2.52.0: Affected

    No fix published

  • pydantic-ai-slim

    Versions
    • >= 1.77.0, < 1.107.7: Affected
    • >= 2.0.0b1, < 2.52.0: Affected

    No fix published

  • pydantic-ai PyPI

    Versions
    • 1.100.0
    • 1.101.0
    • 1.102.0
    • 1.103.0
    • 1.104.0
    • 1.105.0
    • 1.106.0
    • 1.107.0
    • 1.107.1
    • 1.107.2
    • 1.107.4
    • 1.107.5
    • 1.107.6
    • 1.77.0
    • 1.78.0
    • 1.79.0
    • 1.80.0
    • 1.81.0
    • 1.82.0
    • 1.83.0
    • 1.84.0
    • 1.84.1
    • 1.85.0
    • 1.85.1
    • 1.86.0
    • 1.86.1
    • 1.87.0
    • 1.88.0
    • 1.89.0
    • 1.89.1
    • 1.90.0
    • 1.91.0
    • 1.92.0
    • 1.93.0
    • 1.94.0
    • 1.95.0
    • 1.95.1
    • 1.96.0
    • 1.96.1
    • 1.97.0
    • 1.98.0
    • 1.99.0
    Affected ranges
    • ECOSYSTEM: ≥ 1.77.0, < 1.107.7

    Update to 1.107.7

  • pydantic-ai PyPI

    Versions
    • 2.0.0
    • 2.0.0b1
    • 2.0.0b2
    • 2.0.0b3
    • 2.0.0b4
    • 2.0.0b5
    • 2.0.0b6
    • 2.0.0b7
    • 2.1.0
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.13.0
    • 2.14.0
    • 2.14.1
    • 2.15.0
    • 2.16.0
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.2.0
    • 2.20.0
    • 2.21.0
    • 2.22.0
    • 2.23.0
    • 2.24.0
    • 2.25.0
    • 2.26.0
    • 2.27.0
    • 2.27.1
    • 2.28.0
    • 2.29.0
    • 2.3.0
    • 2.30.0
    • 2.31.0
    • 2.31.1
    • 2.32.0
    • 2.32.1
    • 2.32.2
    • 2.33.0
    • 2.34.0
    • 2.35.0
    • 2.35.1
    • 2.35.3
    • 2.36.0
    • 2.37.0
    • 2.38.0
    • 2.39.0
    • 2.4.0
    • 2.40.0
    • 2.41.0
    • 2.42.0
    • 2.43.0
    • 2.44.0
    • 2.45.0
    • 2.46.0
    • 2.47.0
    • 2.48.0
    • 2.49.0
    • 2.5.0
    • 2.5.1
    • 2.50.0
    • 2.51.0
    • 2.6.0
    • 2.7.0
    • 2.8.0
    • 2.9.0
    • 2.9.1
    Affected ranges
    • ECOSYSTEM: ≥ 2.0.0b1, < 2.52.0

    Update to 2.52.0

  • pydantic-ai-slim PyPI

    Versions
    • 1.100.0
    • 1.101.0
    • 1.102.0
    • 1.103.0
    • 1.104.0
    • 1.105.0
    • 1.106.0
    • 1.107.0
    • 1.107.1
    • 1.107.2
    • 1.107.4
    • 1.107.5
    • 1.107.6
    • 1.77.0
    • 1.78.0
    • 1.79.0
    • 1.80.0
    • 1.81.0
    • 1.82.0
    • 1.83.0
    • 1.84.0
    • 1.84.1
    • 1.85.0
    • 1.85.1
    • 1.86.0
    • 1.86.1
    • 1.87.0
    • 1.88.0
    • 1.89.0
    • 1.89.1
    • 1.90.0
    • 1.91.0
    • 1.92.0
    • 1.93.0
    • 1.94.0
    • 1.95.0
    • 1.95.1
    • 1.96.0
    • 1.96.1
    • 1.97.0
    • 1.98.0
    • 1.99.0
    Affected ranges
    • ECOSYSTEM: ≥ 1.77.0, < 1.107.7

    Update to 1.107.7

  • pydantic-ai-slim PyPI

    Versions
    • 2.0.0
    • 2.0.0b1
    • 2.0.0b2
    • 2.0.0b3
    • 2.0.0b4
    • 2.0.0b5
    • 2.0.0b6
    • 2.0.0b7
    • 2.1.0
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.13.0
    • 2.14.0
    • 2.14.1
    • 2.15.0
    • 2.16.0
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.2.0
    • 2.20.0
    • 2.21.0
    • 2.22.0
    • 2.23.0
    • 2.24.0
    • 2.25.0
    • 2.26.0
    • 2.27.0
    • 2.27.1
    • 2.28.0
    • 2.29.0
    • 2.3.0
    • 2.30.0
    • 2.31.0
    • 2.31.1
    • 2.32.0
    • 2.32.1
    • 2.32.2
    • 2.33.0
    • 2.34.0
    • 2.35.0
    • 2.35.1
    • 2.35.3
    • 2.36.0
    • 2.37.0
    • 2.38.0
    • 2.39.0
    • 2.4.0
    • 2.40.0
    • 2.41.0
    • 2.42.0
    • 2.43.0
    • 2.44.0
    • 2.45.0
    • 2.46.0
    • 2.47.0
    • 2.48.0
    • 2.49.0
    • 2.5.0
    • 2.5.1
    • 2.50.0
    • 2.51.0
    • 2.6.0
    • 2.7.0
    • 2.8.0
    • 2.9.0
    • 2.9.1
    Affected ranges
    • ECOSYSTEM: ≥ 2.0.0b1, < 2.52.0

    Update to 2.52.0

  • pydantic-ai PyPI

    Versions
    • 1.100.0
    • 1.101.0
    • 1.102.0
    • 1.103.0
    • 1.104.0
    • 1.105.0
    • 1.106.0
    • 1.107.0
    • 1.107.1
    • 1.107.2
    • 1.107.4
    • 1.107.5
    • 1.107.6
    • 1.77.0
    • 1.78.0
    • 1.79.0
    • 1.80.0
    • 1.81.0
    • 1.82.0
    • 1.83.0
    • 1.84.0
    • 1.84.1
    • 1.85.0
    • 1.85.1
    • 1.86.0
    • 1.86.1
    • 1.87.0
    • 1.88.0
    • 1.89.0
    • 1.89.1
    • 1.90.0
    • 1.91.0
    • 1.92.0
    • 1.93.0
    • 1.94.0
    • 1.95.0
    • 1.95.1
    • 1.96.0
    • 1.96.1
    • 1.97.0
    • 1.98.0
    • 1.99.0
    • 2.0.0
    • 2.0.0b1
    • 2.0.0b2
    • 2.0.0b3
    • 2.0.0b4
    • 2.0.0b5
    • 2.0.0b6
    • 2.0.0b7
    • 2.1.0
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.13.0
    • 2.14.0
    • 2.14.1
    • 2.15.0
    • 2.16.0
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.2.0
    • 2.20.0
    • 2.21.0
    • 2.22.0
    • 2.23.0
    • 2.24.0
    • 2.25.0
    • 2.26.0
    • 2.27.0
    • 2.27.1
    • 2.28.0
    • 2.29.0
    • 2.3.0
    • 2.30.0
    • 2.31.0
    • 2.31.1
    • 2.32.0
    • 2.32.1
    • 2.32.2
    • 2.33.0
    • 2.34.0
    • 2.35.0
    • 2.35.1
    • 2.35.3
    • 2.36.0
    • 2.37.0
    • 2.38.0
    • 2.39.0
    • 2.4.0
    • 2.40.0
    • 2.41.0
    • 2.42.0
    • 2.43.0
    • 2.44.0
    • 2.45.0
    • 2.46.0
    • 2.47.0
    • 2.48.0
    • 2.49.0
    • 2.5.0
    • 2.5.1
    • 2.50.0
    • 2.51.0
    • 2.6.0
    • 2.7.0
    • 2.8.0
    • 2.9.0
    • 2.9.1
    Affected ranges
    • ECOSYSTEM: ≥ 1.77.0, < 1.107.7 ∪ ≥ 2.0.0b1, < 2.52.0

    Update to 1.107.7; Update to 2.52.0

  • pydantic-ai-slim PyPI

    Versions
    • 1.100.0
    • 1.101.0
    • 1.102.0
    • 1.103.0
    • 1.104.0
    • 1.105.0
    • 1.106.0
    • 1.107.0
    • 1.107.1
    • 1.107.2
    • 1.107.4
    • 1.107.5
    • 1.107.6
    • 1.77.0
    • 1.78.0
    • 1.79.0
    • 1.80.0
    • 1.81.0
    • 1.82.0
    • 1.83.0
    • 1.84.0
    • 1.84.1
    • 1.85.0
    • 1.85.1
    • 1.86.0
    • 1.86.1
    • 1.87.0
    • 1.88.0
    • 1.89.0
    • 1.89.1
    • 1.90.0
    • 1.91.0
    • 1.92.0
    • 1.93.0
    • 1.94.0
    • 1.95.0
    • 1.95.1
    • 1.96.0
    • 1.96.1
    • 1.97.0
    • 1.98.0
    • 1.99.0
    • 2.0.0
    • 2.0.0b1
    • 2.0.0b2
    • 2.0.0b3
    • 2.0.0b4
    • 2.0.0b5
    • 2.0.0b6
    • 2.0.0b7
    • 2.1.0
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.13.0
    • 2.14.0
    • 2.14.1
    • 2.15.0
    • 2.16.0
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.2.0
    • 2.20.0
    • 2.21.0
    • 2.22.0
    • 2.23.0
    • 2.24.0
    • 2.25.0
    • 2.26.0
    • 2.27.0
    • 2.27.1
    • 2.28.0
    • 2.29.0
    • 2.3.0
    • 2.30.0
    • 2.31.0
    • 2.31.1
    • 2.32.0
    • 2.32.1
    • 2.32.2
    • 2.33.0
    • 2.34.0
    • 2.35.0
    • 2.35.1
    • 2.35.3
    • 2.36.0
    • 2.37.0
    • 2.38.0
    • 2.39.0
    • 2.4.0
    • 2.40.0
    • 2.41.0
    • 2.42.0
    • 2.43.0
    • 2.44.0
    • 2.45.0
    • 2.46.0
    • 2.47.0
    • 2.48.0
    • 2.49.0
    • 2.5.0
    • 2.5.1
    • 2.50.0
    • 2.51.0
    • 2.6.0
    • 2.7.0
    • 2.8.0
    • 2.9.0
    • 2.9.1
    Affected ranges
    • ECOSYSTEM: ≥ 1.77.0, < 1.107.7 ∪ ≥ 2.0.0b1, < 2.52.0

    Update to 1.107.7; Update to 2.52.0

Original sources

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