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CVE-2026-46678— Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)

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 pydantic-ai是Pydantic组织开源的一个用于构建生产级应用程序和工作流的生成式AI框架。 pydantic-ai 1.56.0版本至1.99.0之前版本存在服务端请求伪造漏洞，该漏洞源于应用启用force_download='allow-local'时，可通过IPv6转换形式编码元数据IP绕过云元数据黑名单，暴露云IAM短期凭据。

CVSS 6.8 · Medium EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories

Affected Version Matrix 2

VendorProduct Version RangeStatus
pydantic pydantic-ai >= 1.56.0, < 1.99.0 affected
pydantic pydantic-ai-slim >= 1.56.0, < 1.99.0 affected
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I. Basic Information for CVE-2026-46678

Vulnerability Information
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Vulnerability Title
Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)
Source: CVE Program / CVE List V5
Vulnerability Description
Pydantic AI is a Python agent framework for building Generative AI applications. In versions 1.56.0 through 1.98.0, when an application opts a URL into force_download='allow-local' (disabling the default block on private/internal IPs), the cloud-metadata blocklist could be bypassed by encoding the metadata IP in an IPv6 transition form (IPv4-mapped IPv6, 6to4, or NAT64), exposing cloud IAM short-term credentials on dual-stack or translated networks. This is an incomplete fix of GHSA-2jrp-274c-jhv3 / CVE-2026-25580, whose remediation did not hold for IPv6-encoded forms of the metadata IPs. An application is affected only if it explicitly opts a FileUrl (ImageUrl, AudioUrl, VideoUrl, DocumentUrl) into force_download='allow-local' on a URL influenced by untrusted input; it is not affected when using bundled integrations to ingest user input (Agent.to_web / clai web, VercelAIAdapter, AGUIAdapter / Agent.to_ag_ui), since they do not propagate force_download from external data, nor when downloading only from developer-controlled URLs. This issue has been fixed in version 1.99.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
pydantic-ai 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pydantic pydantic-ai是Pydantic组织开源的一个用于构建生产级应用程序和工作流的生成式AI框架。 pydantic-ai 1.56.0版本至1.99.0之前版本存在服务端请求伪造漏洞，该漏洞源于应用启用force_download='allow-local'时，可通过IPv6转换形式编码元数据IP绕过云元数据黑名单，暴露云IAM短期凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pydantic pydantic-ai >= 1.56.0, < 1.99.0 -
pydantic pydantic-ai-slim >= 1.56.0, < 1.99.0 -

II. Public POCs for CVE-2026-46678

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III. Intelligence Information for CVE-2026-46678

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Vendor Advisories for CVE-2026-46678 (1)

Vendor Pages for CVE-2026-46678 (1)

Same Patch Batch · pydantic · 2026-07-29 · 3 CVEs total

CVE-2026-54249 6.8 MEDIUM VercelAIAdapter trusts client-controlled `providerMetadata` to construct `UploadedFile` —
CVE-2026-65975 6.5 MEDIUM Pydantic AI AG-UI Adapter: A dangling client-submitted tool call can execute when a traili

IV. Related Vulnerabilities

Same product: pydantic-ai
Same vendor: pydantic
Same weakness: CWE-918

V. Comments for CVE-2026-46678

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