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6.4 Medium

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI.

CVE-2026-107292

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.toweb() 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.

Part of the AI stack

This affects PydanticAI, in Agent frameworks.

Assessment

CVSS
6.4 (v3.1)
Severity
Medium
EPSS
0.13% chance of exploitation in the next 30 days
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
8 October 2026
Last updated
14 October 2026
Weakness
CWE-346, CWE-350
Assigner
security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L

At the source

References

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