CVE WatchJul 15, 2026

CVE-2026-25640

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 to before 1.51.0, a path tr

CVSS

7.1

High

EPSS

0.3%

p27

KEV

—

Exploit Today

0-100

Published: Feb 6, 2026 · Last modified: Jul 15, 2026 · CWE-22 · CWE-79

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-182026-09-14

Technical description

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.34.0 to before 1.51.0, a path traversal vulnerability in the Pydantic AI web UI allows an attacker to serve arbitrary JavaScript in the context of the application by crafting a malicious URL. In affected versions, the CDN URL is constructed using a version query parameter from the request URL. This parameter is not validated, allowing path traversal sequences that cause the server to fetch and serve attacker-controlled HTML/JavaScript from an arbitrary source on the same CDN, instead of the legitimate chat UI package. If a victim clicks the link or visits it via an iframe, attacker-controlled code executes in their browser, enabling theft of chat history and other client-side data. This vulnerability only affects applications that use Agent.to_web to serve a chat interface and clai web to serve a chat interface from the CLI. These are typically run locally (on localhost), but may also be deployed on a remote server. This vulnerability is fixed in 1.51.0.

Official references

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CVECVSSEPSSKEVRExploitTitleMod.

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