Cross-site Request Forgery (CSRF) Affecting pydantic-ai package, versions [1.34.0,1.107.4)[2.0.0b1,2.28.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-PYDANTICAI-20574181
- published8 Oct 2026
- disclosed8 Oct 2026
- creditThai Son Dinh
Introduced: 8 Oct 2026
NewCVE-2026-107295 (opens in a new tab)How to fix?
Upgrade pydantic-ai to version 1.107.4, 2.28.0 or higher.
Overview
pydantic-ai is an AI Agent Framework, the Pydantic way
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) via the post_chat handler in pydantic_ai/ui/_web/api.py, which does not enforce a Content-Type: application/json requirement on the web UI chat endpoint. Because browsers can send CORS-safelisted content types (text/plain, multipart/form-data, application/x-www-form-urlencoded) cross-origin without a preflight, a malicious page visited by a developer running the local web UI can issue a forged POST request to the /chat endpoint. This causes the served agent to execute a run - including any tools it exposes - on behalf of the victim without their knowledge or consent.