Is there a public exploit for CVE-2026-46678?

No public exploit for CVE-2026-46678 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-46678?

CVE-2026-46678 scores CVSS 6.8 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.38%.

What does CVE-2026-46678 affect?

CVE-2026-46678 affects Pydantic pydantic-ai, pydantic-ai-slim. It is part of the AI and agent stack (PydanticAI).

6.8 Medium

Pydantic AI is a Python agent framework for building Generative AI applications.

CVE-2026-46678

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 forcedownload='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 forcedownload='allow-local' on a URL influenced by untrusted input; it is not affected when using bundled integrations to ingest user input (Agent.toweb / clai web, VercelAIAdapter, AGUIAdapter / Agent.toagui), since they do not propagate forcedownload from external data, nor when downloading only from developer-controlled URLs. This issue has been fixed in version 1.99.0.

Part of the AI stack

This affects PydanticAI, in Agent frameworks.

Assessment

CVSS: 6.8 (v3.1)
Severity: Medium
EPSS: 0.38% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 29 July 2026
Last updated: 4 August 2026
Affected: Pydantic · pydantic-ai · pydantic-ai-slim
Weakness: CWE-918
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

At the source

References

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