CVE-2026-25640
CVE-2026-25640 · Pydantic AI affected by Stored XSS via Path Traversal in Web UI CDN URL
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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.
CVSS 7.1 · Высокий · EPSS 0,4% · Есть исправление
- Опубликовано
- Обновлено
Стек: python
Затронутые продукты и версии
pydantic-ai
- Версии
- >= 1.34.0, < 1.51.0: Затронуто
Нет опубликованного исправления
pydantic-ai PyPI
- Версии
- 1.34.0
- 1.35.0
- 1.36.0
- 1.37.0
- 1.38.0
- 1.39.0
- 1.39.1
- 1.40.0
- 1.41.0
- 1.42.0
- 1.43.0
- 1.44.0
- 1.46.0
- 1.47.0
- 1.48.0
- 1.49.0
- 1.50.0
- Затронутые диапазоны версий
- ECOSYSTEM: ≥ 1.34.0, < 1.51.0
Обновитесь до 1.51.0
pydantic-ai-slim PyPI
- Версии
- 1.34.0
- 1.35.0
- 1.36.0
- 1.37.0
- 1.38.0
- 1.39.0
- 1.39.1
- 1.40.0
- 1.41.0
- 1.42.0
- 1.43.0
- 1.44.0
- 1.46.0
- 1.47.0
- 1.48.0
- 1.49.0
- 1.50.0
- Затронутые диапазоны версий
- ECOSYSTEM: ≥ 1.34.0, < 1.51.0
Обновитесь до 1.51.0
Первоисточники
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-wjp5-868j-wqv7
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.51.0
- https://access.redhat.com/security/cve/CVE-2026-25640
- https://bugzilla.redhat.com/show_bug.cgi?id=2437753
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25640.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-25640