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CVE-2026-107287 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/pydantic/pydantic-ai/commit/2b247add4950bef61d352e7ca8aefbd20539180c	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/commit/2fd38792693da00a3ca5412aeffb436787af3545	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/pull/8984	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/pull/8985	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.7	[email protected]	PatchRelease NotesVendor Advisory
https://github.com/pydantic/pydantic-ai/releases/tag/v2.52.0	[email protected]	PatchRelease NotesVendor Advisory
https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-v36g-jcw9-x7cw	[email protected]	Vendor Advisory

see all 7 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-400	Uncontrolled Resource Consumption	[email protected]
CWE-407	Inefficient Algorithmic Complexity	[email protected]

Affected Products

Product	Versions
pydantic pydantic ai	>= 1.77.0, < 1.107.7 >= 2.0.0, < 2.52.0
CPE cpe:2.3:a:pydantic:pydantic_ai::::::python::* cpe:2.3:a:pydantic:pydantic_ai::-::::python:: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 14, 2026	CVE Modified	CISA-ADP
Oct 13, 2026	Initial Analysis	[email protected]
Oct 8, 2026	New CVE Received	[email protected]