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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107295
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 17:17:15 UTC
Updated2026-10-08 18:17:17 UTC
DescriptionPydantic 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.

Risk And Classification

Primary CVSS: v3.1 7.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

Problem Types: CWE-352 | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
3.1CNADECLARED7.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pydantic Pydantic-ai affected >= 1.34.0, < 1.107.4 Not specified
CNA Pydantic Pydantic-ai affected >= 2.0.0b1, < 2.28.0 Not specified
CNA Pydantic Pydantic-ai-slim affected >= 1.34.0, < 1.107.4 Not specified
CNA Pydantic Pydantic-ai-slim affected >= 2.0.0b1, < 2.28.0 Not specified

References

ReferenceSourceLinkTags
github.com/pydantic/pydantic-ai/commit/dd2abbdfa029c9ad138e7cc0edd2eaeaf... [email protected] github.com
github.com/pydantic/pydantic-ai/pull/7383 [email protected] github.com
github.com/pydantic/pydantic-ai/releases/tag/v2.28.0 [email protected] github.com
github.com/pydantic/pydantic-ai/security/advisories/GHSA-h4xc-3qfq-jf93 [email protected] github.com
github.com/pydantic/pydantic-ai/releases/tag/v1.107.4 [email protected] github.com
github.com/pydantic/pydantic-ai/commit/d2690201a1834005d382dbf5c47e0ed94... [email protected] github.com
github.com/pydantic/pydantic-ai/pull/7382 [email protected] github.com
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