CVE-2026-25640
- Source
- https://cve.org/CVERecord?id=CVE-2026-25640
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25640.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-25640
- Aliases
- Published
- 2026-02-06T20:01:53.892Z
- Modified
- 2026-02-22T00:38:29.148677Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N CVSS Calculator
- Summary
- Pydantic AI affected by Stored XSS via Path Traversal in Web UI CDN URL
- Details
-
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.
- Database specific
{ "cwe_ids": [ "CWE-22", "CWE-79" ], "cna_assigner": "GitHub_M", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25640.json" }- References