CVE-2026-107295— `pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that can trigger agent tool execution
Quick assessment
Affected
pydantic pydantic-ai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Pydantic AI 是一个用于构建生成式 AI 应用和工作流的 Python 智能体框架。在版本 1.34.0 至 1.107.4 以及 2.28.0 之前的版本中， 方法和 CLI Web 开发聊天端点存在请求内容类型（Content-Type）验证缺失的问题。开发者访问的网站可以向绑定在本地回环地址（loopback）的聊天服务器提交浏览器兼容的请求，从而导致运行的智能体以本地进程的权限和凭据执行工具；此外，客户端中继的审批决策也会使需要审批（ ）的工具暴露出来。绑定到本地主机（localhost）并不能阻
Possible ATT&CK Techniques 3 AI
T1041 · Exfiltration Over C2 Channel T1059 · Command and Scripting Interpreter T1210 · Exploitation of Remote ServicesAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| pydantic | pydantic-ai | >= 1.34.0, < 1.107.4 |
affected |
>= 2.0.0b1, < 2.28.0 |
affected | ||
| pydantic | pydantic-ai-slim | >= 1.34.0, < 1.107.4 |
affected |
>= 2.0.0b1, < 2.28.0 |
affected |
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I. Basic Information for CVE-2026-107295
Vulnerability Information
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Vulnerability Title
`pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that can trigger agent tool execution
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| pydantic | pydantic-ai | >= 1.34.0, < 1.107.4 | - |
|
| pydantic | pydantic-ai-slim | >= 1.34.0, < 1.107.4 | - |
|
II. Public POCs for CVE-2026-107295
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-107295 (7)
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https://github.com/pydantic/pydantic-ai/pull/7382 x_refsource_MISC
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https://github.com/pydantic/pydantic-ai/pull/7383 x_refsource_MISC
-
https://github.com/pydantic/pydantic-ai/releases/tag/v2.28.0 x_refsource_MISC
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https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.4 x_refsource_MISC
-
https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-h4xc-3qfq-jf93 x_refsource_CONFIRM
Same Patch Batch · pydantic · 2026-10-08 · 10 CVEs total
| CVE-2026-107286 | 7.5 HIGH | Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends e |
| CVE-2026-107289 | 6.8 MEDIUM | Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv6 zone identifier (incomplete fix |
| CVE-2026-107287 | 6.5 MEDIUM | Pydantic AI: Excessive resource use when local web fetching converts nested HTML |
| CVE-2026-107290 | 6.5 MEDIUM | Pydantic AI: Event loop blocked by quadratic title extraction in `web_fetch` |
| CVE-2026-107294 | 6.5 MEDIUM | Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl |
| CVE-2026-107292 | 6.4 MEDIUM | Pydantic AI Web chat UI (`Agent.to_web()`, `clai web`): the local chat endpoint does not v |
| CVE-2026-107288 | 3.7 LOW | Pydantic AI: web_fetch_tool blocked_domains bypass via a hostname the resolver normalizes |
| CVE-2026-107291 | 2.3 LOW | Pydantic AI OpenTelemetry instrumentation: exception events on tool and agent run spans in |
| CVE-2026-107293 | 2.3 LOW | Pydantic AI OpenTelemetry instrumentation: retry prompt content is not redacted when `incl |
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