CVE-2026-107292 (GCVE-0-2026-107292)

Vulnerability from cvelistv5 – Published: 2026-10-08 16:26 – Updated: 2026-10-08 16:26
VLAI
Title
Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): the local chat endpoint does not validate the `Host` header
Summary
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.
Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
CWE
  • CWE-346 - Origin Validation Error
  • CWE-350 - Reliance on Reverse DNS Resolution for a Security-Critical Action
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7642 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
pydantic pydantic-ai Affected: >= 1.34.0, < 2.0.0b1
Affected: >= 2.0.0b1, < 2.30.0
guessed Create a notification for this product.
pydantic pydantic-ai-slim Affected: >= 1.34.0, < 2.0.0b1
Affected: >= 2.0.0b1, < 2.30.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

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