Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.56.0 until 1.107.6 and 2.44.0, applications that opt attacker-influenced URLs into local network access through FileUrl with force_download='allow-local' or web_fetch_tool with allow_local_urls=True can bypass the cloud-metadata blocklist by appending an IPv6 zone identifier to an IPv6 metadata address. IPv6Address equality and hashing include the zone identifier, so the blocklist comparison fails even though the network stack ignores the zone on a non-link-local destination and reaches the metadata service, potentially exposing cloud IAM credentials. The opt-in settings are disabled by default, and the issue requires an IPv6-enabled environment. This issue is fixed in versions 1.107.6 and 2.44.0.
Fix
Patch, vendor advisory and mitigation references on NVD 7
- https://github.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f9fb0e5b Exploit, Patch
- https://github.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a33340dbd55 Exploit, Patch
- https://github.com/pydantic/pydantic-ai/pull/8401 Exploit, Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/pull/8402 Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6 Patch, Release Notes, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0 Patch, Release Notes, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-vmxc-h2x2-jmf3 Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.8 · pydanticNVD modified 2026-10-13 14:34
Affected (CPE criteria) 2
cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*cpe:2.3:a:pydantic:pydantic_ai:*:-:*:*:*:python:*:*
References 7
- https://github.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f9fb0e5b Exploit, Patch
- https://github.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a33340dbd55 Exploit, Patch
- https://github.com/pydantic/pydantic-ai/pull/8401 Exploit, Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/pull/8402 Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6 Patch, Release Notes, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0 Patch, Release Notes, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-vmxc-h2x2-jmf3 Exploit, Mitigation, Vendor Advisory