CVEvulnerability
CVE-2026-107288
3.7 LOW
Official page ↗
- Status
- Analyzed
- Published
- 2026-10-08
- Last modified
- 2026-10-13
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 3.7 LOW — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weaknesses
- CWE-1289, CWE-918
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.
Affected configurations
• pydantic pydantic ai (>= 1.77.0 < 1.107.6)
• pydantic pydantic ai (>= 2.0.0 < 2.44.0)
Related
References
- https://github.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812 Patch
- https://github.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284 Patch
- https://github.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983 Patch
- https://github.com/pydantic/pydantic-ai/pull/8407 Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/pull/8409 Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/pull/8421 Patch, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6 Patch, Release Notes, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0 Patch, Release Notes, Vendor Advisory
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j Mitigation, Vendor Advisory