6.4

CVE-2026-107292

Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): the local chat endpoint does not validate the `Host` header

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerpydantic
≫
Produkt pydantic-ai
Version >= 1.34.0, < 2.0.0b1
Status affected
Version >= 2.0.0b1, < 2.30.0
Status affected
Herstellerpydantic
≫
Produkt pydantic-ai-slim
Version >= 1.34.0, < 2.0.0b1
Status affected
Version >= 2.0.0b1, < 2.30.0
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.024
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 6.4 1.6 4.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
CWE-346 Origin Validation Error

The product does not properly verify that the source of data or communication is valid.

CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action

The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname.

https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-q2xc-rrxj-58x9
https://github.com/pydantic/pydantic-ai/pull/7437
https://github.com/pydantic/pydantic-ai/pull/7438
https://github.com/pydantic/pydantic-ai/commit/394cc1d31656620704a703a2daed752afa5135fe
https://github.com/pydantic/pydantic-ai/commit/871c7aeec5dfed2138655ccbccbf15c6d763bae7
https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.5
https://github.com/pydantic/pydantic-ai/releases/tag/v2.30.0