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CVE-2026-107288

3.7 · LOW

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI.

Published Oct 8, 2026pydanticCWE-918EPSS 0.37%

Overview

CVE-2026-107288 is a low-severity vulnerability affecting pydantic pydantic_ai. It was published on October 8, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from pydantic. Update pydantic_ai to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
pydanticpydantic_ai>= 1.77.0, < 1.107.6Affected

References

GitHubgithub.com/pydantic/pydantic-ai/commit/490335f8e2322e143a79337ddca9410e0176c812GitHubgithub.com/pydantic/pydantic-ai/commit/a9dab92099d0ef9d5d4aa34ccac8a6f1b0e51284GitHubgithub.com/pydantic/pydantic-ai/commit/c1f212a084cbfa0012f2044cdb4731d214b3b983GitHubgithub.com/pydantic/pydantic-ai/pull/8407GitHubgithub.com/pydantic/pydantic-ai/pull/8409GitHubgithub.com/pydantic/pydantic-ai/pull/8421GitHubgithub.com/pydantic/pydantic-ai/releases/tag/v1.107.6GitHubgithub.com/pydantic/pydantic-ai/releases/tag/v2.44.0GitHubgithub.com/pydantic/pydantic-ai/security/advisories/GHSA-22h6-qm39-v87j

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107288?

CVE-2026-107288 is a low-severity vulnerability affecting pydantic pydantic_ai. It was published on October 8, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-107288?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107288?

Check the references section for vendor advisories and patches from pydantic. Update pydantic_ai to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-107288?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107288 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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