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CVE-2026-107290 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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/2faa6181d8a17d83bc9516d035c5270db8730fa0	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/commit/9cdc952e4c3319e85a3e04f2de49fbbb765bd38b	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/commit/a93ea5226be1e93ae13131ae3f22287190411389	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/commit/c3fd1cc1f15fdbf750d78e4e3ec1e8b4d6a3d920	[email protected]	ExploitPatch
https://github.com/pydantic/pydantic-ai/commit/fb92ccfc3ca2735dab877e2ed73856681bf72ad1	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/pull/8397	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/pull/8399	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/pull/8418	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/pull/84332	[email protected]	Broken Link
https://github.com/pydantic/pydantic-ai/pull/8434	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6	[email protected]	PatchRelease NotesVendor Advisory
https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0	[email protected]	PatchRelease NotesVendor Advisory
https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-fpf4-vwcp-v4hp	[email protected]	Vendor Advisory

see all 13 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1333	Inefficient Regular Expression Complexity	[email protected]

Affected Products

Product	Versions
pydantic pydantic ai	>= 1.77.0, < 1.107.6 >= 2.0.0, < 2.44.0
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 13, 2026	Initial Analysis	[email protected]
Oct 9, 2026	CVE Modified	CISA-ADP
Oct 8, 2026	New CVE Received	[email protected]