CVE-2026-107288: 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 1.77.0 until 1.107.6 and 2.44.0, the local web_fetch_tool and the WebFetch local fallback compare blocked_domains entries with a URL hostname before both values are normalized to the form used by getaddrinfo. An attacker-influenced model can use an equivalent IDNA spelling, non-ASCII label separator, case variation, or trailing root label that resolves to a blocked host but does not match the configured string, causing the application to fetch that host with its own privileges. allowed_domains fails closed for unmatched spellings, and private-IP and cloud-metadata protections remain effective. This issue is fixed in versions 1.107.6 and 2.44.0.
CVSS v3.1
Score 3.7low
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: 6ac7be8a2cdf04f65627bc32
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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