CVE-2026-107289
mediumPydantic AI is a Python agent framework for building applications and workflows with Generative AI.
Vendor / product: Pydantic — pydantic ai
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f9fb0e5b security-advisories@github.com
- https://github.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a33340dbd55 security-advisories@github.com
- https://github.com/pydantic/pydantic-ai/pull/8401 security-advisories@github.com
- https://github.com/pydantic/pydantic-ai/pull/8402 security-advisories@github.com
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6 security-advisories@github.com
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0 security-advisories@github.com
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-vmxc-h2x2-jmf3 security-advisories@github.com