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6.8 Medium

CVE-2026-107289 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI

Description

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.

Affected products and versions

Product Affected versions Fixed in
pydantic-ai 2.0 2.0.0b1 → < 2.44.0 2.44.0
pydantic-ai 1.56 1.56.0 → < 1.107.6 1.107.6
pydantic-ai-slim 2.0 2.0.0b1 → < 2.44.0 2.44.0
pydantic-ai-slim 1.56 1.56.0 → < 1.107.6 1.107.6

References

Timeline

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Other CVEs of pydantic-ai

The 16 CVEs of pydantic-ai →
CVE-2026-107295 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 7.6 High CVE-2026-107294 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 6.5 Medium CVE-2026-107293 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 2.3 Low CVE-2026-107292 Pydantic AI is a Python agent framework for building applications and workflows with Generative AI 6.4 Medium
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