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CVE-2026-107290

6.5 · MEDIUM

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

Published Oct 8, 2026pydanticCWE-1333EPSS 0.51%

Overview

CVE-2026-107290 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 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is 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 process server-controlled responses with quadratic title extraction, whitespace normalization, and ordered-list numbering. An attacker-controlled page of modest size can therefore block the event loop for an extended period, stalling other agent runs and requests, while unsupported codecs or excessive HTML or JSON nesting can abort an individual run. 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/2faa6181d8a17d83bc9516d035c5270db8730fa0GitHubgithub.com/pydantic/pydantic-ai/commit/9cdc952e4c3319e85a3e04f2de49fbbb765bd38bGitHubgithub.com/pydantic/pydantic-ai/commit/a93ea5226be1e93ae13131ae3f22287190411389GitHubgithub.com/pydantic/pydantic-ai/commit/c3fd1cc1f15fdbf750d78e4e3ec1e8b4d6a3d920GitHubgithub.com/pydantic/pydantic-ai/commit/fb92ccfc3ca2735dab877e2ed73856681bf72ad1GitHubgithub.com/pydantic/pydantic-ai/pull/8397GitHubgithub.com/pydantic/pydantic-ai/pull/8399GitHubgithub.com/pydantic/pydantic-ai/pull/8418GitHubgithub.com/pydantic/pydantic-ai/pull/84332GitHubgithub.com/pydantic/pydantic-ai/pull/8434

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107290?

CVE-2026-107290 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 6.5 (MEDIUM).

How severe is CVE-2026-107290?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-107290?

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-2026-107290?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107290 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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