CVE-2026-107292 — Pydantic AI is a Python agent framework for building applications and workflows with Generative AI.
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.
CVSS v3.1 base metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:LMedium severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Network
Attack Vector
AC
High
Attack Complexity
PR
None
Privileges Required
UI
Required
User Interaction
S
Unchanged
Scope
C
Low
Confidentiality
I
High
Integrity
A
Low
Availability
Affected
- Vendor
- PyPI
- Product
- pydantic-ai
Versions
- pkg:pypi/pydantic-ai >= 1.34.0, < 1.107.5
- pkg:pypi/pydantic-ai >= 2.0.0b1, < 2.30.0
- pkg:pypi/pydantic-ai-slim >= 1.34.0, < 1.107.5
- pkg:pypi/pydantic-ai-slim >= 2.0.0b1, < 2.30.0
Stated as the source expressed them.
References
- advisory[email protected]https://github.com/pydantic/pydantic-ai/commit/394cc1d31656620704a703a2daed752afa5135fe
- advisory[email protected]https://github.com/pydantic/pydantic-ai/commit/871c7aeec5dfed2138655ccbccbf15c6d763bae7
- advisory[email protected]https://github.com/pydantic/pydantic-ai/pull/7437
- advisory[email protected]https://github.com/pydantic/pydantic-ai/pull/7438
- advisory[email protected]https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.5
- advisory[email protected]https://github.com/pydantic/pydantic-ai/releases/tag/v2.30.0
- advisory[email protected]https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-q2xc-rrxj-58x9
- advisoryOSV GHSA-q2xc-rrxj-58x9https://osv.dev/vulnerability/GHSA-q2xc-rrxj-58x9
- vendorOSV packagehttps://github.com/pydantic/pydantic-ai
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