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...

CVE-2026-46678

Pydantic AI CVE-2026-46678 affects versions 1.56.0–1.98.0 where force_download='allow-local' on a URL influenced by untrusted input can bypass the cloud-metadata blocklist using IPv6 transition forms (IPv4-mapped IPv6, 6to4, NAT64, NAT64/isatap variants). The issue is mitigated by upgrading to 1....

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

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...

PYSEC-2026-2977 pydantic-ai: SSRF blocklist bypass via IPv4-compatible, SIIT/IVI, and local NAT64 IPv6 addresses (incomplete fix of CVE-2026-46678)

Summary When an application using Pydantic AI opts a URL into forcedownload='allow-local' which disables the default block on private/internal IPs and runs on a network that routes the affected IPv6 transition forms NAT64- or ISATAP-configured networks, the cloud-metadata blocklist could be...