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CVE-2026-107289

6.8 · MEDIUM

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

Published Oct 8, 2026pydanticCWE-918EPSS 0.39%

Overview

CVE-2026-107289 is a medium-severity vulnerability affecting pydantic pydantic_ai. It was published on October 8, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. 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 1.56.0 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.

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>= 1.56.0, < 1.107.6Affected

References

GitHubgithub.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f9fb0e5bGitHubgithub.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a33340dbd55GitHubgithub.com/pydantic/pydantic-ai/pull/8401GitHubgithub.com/pydantic/pydantic-ai/pull/8402GitHubgithub.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-vmxc-h2x2-jmf3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107289?

CVE-2026-107289 is a medium-severity vulnerability affecting pydantic pydantic_ai. It was published on October 8, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-107289?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107289?

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-2026-107289?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107289 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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