Vulnerability in Pydantic Pydantic-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.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.
Published .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Pydantic Pydantic-Ai — versions >= 1.34.0, < 2.0.0b1, >= 2.0.0b1, < 2.30.0
- Pydantic Pydantic-Ai-Slim — versions >= 1.34.0, < 2.0.0b1, >= 2.0.0b1, < 2.30.0
Weakness classification (CWE)
References
- github.com/pydantic/pydantic-ai/security/advisories/GHSA-q2xc-rrxj-58x9
- github.com/pydantic/pydantic-ai/pull/7437
- github.com/pydantic/pydantic-ai/pull/7438
- github.com/pydantic/pydantic-ai/commit/394cc1d31656620704a703a2daed752afa5135fe
- github.com/pydantic/pydantic-ai/commit/871c7aeec5dfed2138655ccbccbf15c6d763bae7
- github.com/pydantic/pydantic-ai/releases/tag/v1.107.5
- github.com/pydantic/pydantic-ai/releases/tag/v2.30.0
Frequently asked questions
- What is CVE-2026-107292?
- CVE-2026-107292 is a medium-severity vulnerability in Pydantic Pydantic-Ai, classified under Origin Validation Error. CVSS score: 6.4/10. Published 2026-10-08.
- How severe is CVE-2026-107292?
- Medium severity. CVSS v3 base score is 6.4 out of 10.