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CVE-2026-107292 Details

Description

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 2.30.0, the Agent.to_web() and clai web development chat server does not validate the Host header, allowing a website visited by a developer to use DNS rebinding to reach a loopback-hosted agent as a same-origin service. The hostile page can read the served UI and submit chat requests that execute agent tools with the local process's privileges and credentials, causing data disclosure or unwanted side effects. Binding to localhost, Origin checks, and CSRF tokens do not prevent the same-origin DNS rebinding path. This issue is fixed in versions 1.107.5 and 2.30.0.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.4 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/pydantic/pydantic-ai/commit/394cc1d31656620704a703a2daed752afa5135fe	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/commit/871c7aeec5dfed2138655ccbccbf15c6d763bae7	[email protected]	Patch
https://github.com/pydantic/pydantic-ai/pull/7437	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/pull/7438	[email protected]	PatchVendor Advisory
https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.5	[email protected]	PatchRelease NotesVendor Advisory
https://github.com/pydantic/pydantic-ai/releases/tag/v2.30.0	[email protected]	PatchRelease NotesVendor Advisory
https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-q2xc-rrxj-58x9	[email protected]	Vendor Advisory

see all 7 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-346	Origin Validation Error	[email protected]
CWE-350	Reliance on Reverse DNS Resolution for a Security-Critical Action	[email protected]

Affected Products

Product	Versions
pydantic pydantic ai	>= 1.34.0, < 1.107.5 >= 2.0.0, < 2.30.0
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]