CVE-2026-107289: CWE-918: Server-Side Request Forgery (SSRF) in pydantic pydantic-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.
CVSS v3.1
Score 6.8medium
Affected software
pydantic
pydantic-ai
pydantic
pydantic-ai-slim
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-07T15:53:23.586Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac7be8a2cdf04f65627bc33
Added to database: 10/08/2026, 16:02:18 UTC
Last updated: 10/08/2026, 16:02:18 UTC
Views: 1
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