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CVE-2026-107295

`pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that can trigger agent tool execution PUBLISHED

Description (CNA)

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 until 1.107.4 and 2.28.0, the Agent.to_web() and clai web development chat endpoint has missing request content-type validation. A website visited by a developer can submit a browser-compatible request to a loopback-hosted chat server, causing the served agent to run and execute tools with the privileges and credentials of the local process; client-relayed approval decisions also leave requires_approval=True tools exposed. Binding to localhost does not prevent a browser page from reaching the loopback address. This issue is fixed in versions 1.107.4 and 2.28.0.

Affected (CNA)

Vendor / productVersions
pydantic / pydantic-aiaffected >= 1.34.0, < 1.107.4; affected >= 2.0.0b1, < 2.28.0
pydantic / pydantic-ai-slimaffected >= 1.34.0, < 1.107.4; affected >= 2.0.0b1, < 2.28.0

CWE

CWE-352

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.