Pydantic AI: Excessive resource use when local web fetching converts nested HTML
Summary
Applications using Pydantic AI's local web-fetch tool can experience excessive CPU and memory use when it converts attacker-controlled HTML. An agent must fetch the affected page; provider-native web fetching is not affected.
Details
Nested block elements cause HTML-to-Markdown conversion to reprocess accumulated text at each level and can greatly expand the intermediate output. The response-body limit bounds downloaded bytes, while the returned-content limit is applied only after conversion. On current releases, conversion runs in a worker thread but can still consume substantial resources and delay other work in the process. Older releases performed conversion on the event loop.
Mitigation
Upgrade to a patched release of pydantic-ai or pydantic-ai-slim. If you cannot upgrade yet, avoid using local web fetching for attacker-controlled HTML.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | pydantic-ai | >= 1.77.0, < 1.107.7, >= 2.0.0b1, < 2.52.0 | 1.107.7, 2.52.0 |
| Python (PyPI) | pydantic-ai-slim | >= 1.77.0, < 1.107.7, >= 2.0.0b1, < 2.52.0 | 1.107.7, 2.52.0 |
Referencias
- 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
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0
- https://pypi.org/project/pydantic-ai
- https://github.com/advisories/GHSA-v36g-jcw9-x7cw
- https://nvd.nist.gov/vuln/detail/CVE-2026-107287
- https://pypi.org/project/pydantic-ai-slim
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H- Debilidad (CWE)
CWE-400, CWE-407- Plataforma
- Python (PyPI)
- Paquete
pydantic-ai, pydantic-ai-slim- Publicada
- 08.10.2026
- Actualizado
- 15.10.2026 18:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-4281 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-v36g-jcw9-x7cw - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-4290 - PyPA Advisory Database; CC BY 4.0
Historial de vulnerabilidades: pydantic-ai-slim
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 14
- Primera → última
- 02.2026 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 4
- Media 8
- Baja 2
Divulgaciones por año
- 2026: 14
-
Pydantic AI: Excessive resource use when local web fetching converts nested HTML esta entrada
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