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CVE-2026-107291

4.3 · MEDIUM

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

Published Oct 8, 2026pydanticCWE-212EPSS 0.62%

Overview

CVE-2026-107291 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 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, 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 0.3.4 until 1.107.6 and 2.44.0, OpenTelemetry instrumentation configured with InstrumentationSettings(include_content=False) can still export sensitive agent content through exception.message and exception.stacktrace events, error status descriptions, and model_request_parameters containing instructions or the prompted_output_template. The exposed data is available to readers of the configured telemetry backend and can include tool feedback, provider error bodies, runtime instructions, and structured-output templates even though message attributes are redacted. This issue does not grant new access to agent data, and deployments that do not use include_content=False are not affected by the setting bypass. 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>= 0.3.4, < 1.107.4Affected

References

GitHubgithub.com/pydantic/pydantic-ai/commit/4e013c51a50659aba2adf7853bfb22bb77f6a518GitHubgithub.com/pydantic/pydantic-ai/commit/6b14c74cb281f899a2ae4fae5327111e33f60771GitHubgithub.com/pydantic/pydantic-ai/commit/7ee27e38ab2e525ca60ff1a25d16413ff989fd79GitHubgithub.com/pydantic/pydantic-ai/commit/963dec5f70d6f558997fc259356c0090cc5ea487GitHubgithub.com/pydantic/pydantic-ai/commit/de4e61515327bd80a19cd8552001c30933e6acc3GitHubgithub.com/pydantic/pydantic-ai/pull/8403GitHubgithub.com/pydantic/pydantic-ai/pull/8404GitHubgithub.com/pydantic/pydantic-ai/pull/8408GitHubgithub.com/pydantic/pydantic-ai/pull/8428GitHubgithub.com/pydantic/pydantic-ai/pull/8429

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107291?

CVE-2026-107291 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 4.3 (MEDIUM).

How severe is CVE-2026-107291?

This vulnerability has a CVSS 3.1 base score of 4.3, 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-2026-107291?

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-2026-107291?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107291 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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