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
- 2026-02-06T20:01:53Z
- Modified
- 2026-10-21T02:56:29Z
- 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
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-22", "CWE-79" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25640.json" }- References
-
- https://github.com/pydantic/pydantic-ai/releases/tag/v1.51.0
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25640.json
- https://access.redhat.com/security/cve/CVE-2026-25640
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25640.json
- https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-wjp5-868j-wqv7
- https://nvd.nist.gov/vuln/detail/CVE-2026-25640
- https://bugzilla.redhat.com/show_bug.cgi?id=2437753
Affected packages
Git / github.com/pydantic/pydantic-ai
Affected ranges
- Type
- GIT
- Repo
- https://github.com/pydantic/pydantic-ai
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "1.34.0" }, { "fixed": "1.51.0" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "original_tag": "v1.51.0", "range": [ { "fixed": "5ab6940f7f0231dc1fc62ab16dea35de018ceebc" } ], "source": "REFERENCES_TAG" }, { "cpe": "cpe:2.3:a:pydantic:pydantic_ai:*:*:*:*:*:python:*:*", "range": [ { "introduced": "1.34.0" }, { "fixed": "1.51.0" } ], "source": "CPE_RANGE" } ] }