pydantic pydantic-ai up to 1.105.0/2.0.0b5 UI adapter path traversal

Summaryinfo

A vulnerability classified as problematic was found in pydantic pydantic-ai up to 1.105.0/2.0.0b5. Affected by this issue is some unknown functionality of the component UI adapter. Executing a manipulation can lead to path traversal. This vulnerability is handled as CVE-2026-54249. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in pydantic pydantic-ai up to 1.105.0/2.0.0b5 and classified as problematic. This vulnerability affects an unknown function of the component UI adapter. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

Pydantic AI is a Python agent framework for building Generative AI applications. In versions 1.65.0 through 1.105.0, and 2.0.0b1 through 2.0.0b5, a client that submits message history to a Pydantic AI UI adapter (such as the Vercel AI adapter) can reference arbitrary files in the application's model-provider or cloud-storage account. While file URL parts are validated against a scheme allowlist, UploadedFile references — which point to a file by provider file ID or cloud-storage URI (e.g. s3://…, gs://…) — were forwarded without validation. Because the provider resolves an UploadedFile using the server-side identity (IAM role, service account, or provider API key) rather than the client's, an attacker can craft message history to make the server read objects from its own account or other tenants, given a referenceable identifier. Exploitation requires a valid file identifier, which is not always unguessable depending on how the application names objects. This issue has been fixed in versions 1.106.0 and 2.0.0b6.

The advisory is available at github.com. This vulnerability was named CVE-2026-54249 since 06/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 1.106.0 or 2.0.0b6 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• pydantic

Name

• pydantic-ai

Version

• 1.105
• 2.0.0b5

Website

• Product: https://github.com/pydantic/pydantic-ai/

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CPE 2.2info

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