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CVE-2026-107294— Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl

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 是一个用于使用生成式人工智能构建应用和工作流的 Python 智能体框架。在版本 1.77.0 至 1.107.2，以及 2.24.0 之前， 、本地 WebFetch 回退机制以及远程 FileUrl 媒体下载功能会在强制执行内容大小控制之前，将完整的 HTTP 响应体缓冲到内存中。攻击者通过操控 URL，可以发送任意大小的响应流，从而耗尽进程内存并导致工作进程崩溃；受影响的媒体类型包括 ImageUrl、DocumentUrl、VideoUrl 和 AudioUrl。SSRF（服务器端请

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
pydantic pydantic-ai >= 1.77.0, < 1.107.2 affected
>= 2.0.0b1, < 2.24.0 affected
pydantic pydantic-ai-slim >= 1.77.0, < 1.107.2 affected
>= 2.0.0b1, < 2.24.0 affected
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I. Basic Information for CVE-2026-107294

Vulnerability Information
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Vulnerability Title
Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl
Source: CVE Program / CVE List V5
Vulnerability Description
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pydantic pydantic-ai >= 1.77.0, < 1.107.2 -
pydantic pydantic-ai-slim >= 1.77.0, < 1.107.2 -

II. Public POCs for CVE-2026-107294

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III. Intelligence Information for CVE-2026-107294

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Patches & Fixes for CVE-2026-107294 (2)

Other References for CVE-2026-107294 (3)

Same Patch Batch · pydantic · 2026-10-08 · 10 CVEs total

CVE-2026-107295 7.6 HIGH `pydantic-ai-slim` web UI `/api/chat` accepts browser-simple cross-origin requests that ca
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-2026-107292 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

IV. Related Vulnerabilities

Same product: pydantic-ai
Same vendor: pydantic
Same weakness: CWE-400

V. Comments for CVE-2026-107294

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