CVE-2026-46678
- Source
- https://cve.org/CVERecord?id=CVE-2026-46678
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46678.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-46678
- Aliases
- Downstream
- Published
- 2026-07-29T20:16:45.986Z
- Modified
- 2026-08-01T03:33:01.912236487Z
- Severity
-
- 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
- Summary
- Pydantic AI: SSRF cloud-metadata blocklist bypass via IPv4-mapped IPv6 (Incomplete fix of CVE-2026-25580)
- Details
-
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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46678.json", "cwe_ids": [ "CWE-918" ], "cna_assigner": "GitHub_M" }- References