CVE-2026-107288
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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.
Quick Facts
| CVE ID | CVE-2026-107288 |
| CVSS Score | 3.7 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
| Published | 2026-10-08 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
References
- https://github.com/pydantic/pydantic-ai/commit/490335f8e2322…
- https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0e…
- https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbf…
- https://github.com/pydantic/pydantic-ai/pull/8407
- https://github.com/pydantic/pydantic-ai/pull/8409
- https://github.com/pydantic/pydantic-ai/pull/8421
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.…
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0
- https://github.com/pydantic/pydantic-ai/security/advisories/…