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{"bugzilla": {"description": "Pydantic AI: Pydantic AI: Arbitrary code execution and information disclosure via path traversal in web UI", "id": "2437753", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2437753"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-22", "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.", "A flaw was found in Pydantic AI. A remote attacker can exploit a path traversal vulnerability in the Pydantic AI web UI by crafting a malicious URL. This vulnerability arises from insufficient validation of the version query parameter, allowing the server to fetch and serve attacker-controlled HTML or JavaScript. If a victim clicks on such a link, malicious code can execute in their browser, potentially leading to the theft of sensitive client-side data, including chat history."], "mitigation": {"lang": "en:us", "value": "To reduce exposure, restrict network access to the Pydantic AI web interface. If the application is deployed on a remote server, configure firewall rules to limit access to trusted networks or localhost. This prevents untrusted clients from reaching the vulnerable component. After applying firewall changes, ensure the rules are persistent and the firewall service is reloaded."}, "name": "CVE-2026-25640", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}], "public_date": "2026-02-06T20:01:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-25640\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-25640\nhttps://github.com/pydantic/pydantic-ai/releases/tag/v1.51.0\nhttps://github.com/pydantic/pydantic-ai/security/advisories/GHSA-wjp5-868j-wqv7"], "statement": "This IMPORTANT vulnerability in Pydantic AI, as included in Red Hat Enterprise Linux AI, involves a path traversal flaw in the web UI's CDN URL construction. An attacker can exploit this by crafting a malicious URL, leading to arbitrary JavaScript execution in a victim's browser if they click the link. This primarily affects deployments utilizing Agent.to_web or clai web for chat interfaces.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-17T22:28:56.709851+00:00", "value": {"mitigation_remediation": ["Upgrade Pydantic AI to version 1.51.0 or later to remove the vulnerable code path.", "Restrict access to the Agent.to_web and Agent.cli chat interfaces to trusted users or disable them when not needed.", "Implement a strict Content Security Policy that disallows inline scripts and limits script sources to a known CDN.", "If an upgrade cannot be performed immediately, sanitize or whitelist the version query parameter used to fetch the CDN resource to prevent traversal from the client\u2019s input."], "summary": {"action": "Patch Now", "impact": "Stored XSS via Path Traversal"}, "threat_synthesis": {"affected_systems": "The vulnerability is present in Pydantic AI versions from 1.34.0 up to, but not including, 1.51.0. It affects applications that use Agent.to_web or Agent.cli to expose a chat interface, typically running locally on localhost but also possible on remote servers.", "description_and_impact": "A path traversal flaw in Pydantic AI\u2019s web UI allows an attacker to construct a malicious URL that causes the server to load and serve arbitrary JavaScript from the CDN. When the vulnerable version query parameter is unvalidated, the server fetches attacker\u2011controlled HTML/JavaScript and delivers it to the victim\u2019s browser, resulting in a stored cross\u2011site scripting (XSS) attack that can steal chat history and other client\u2011side data. The weakness is reflected in CWE\u201122 (Path Traversal) and CWE\u201179 (Cross\u2011Site Scripting).", "risk_and_exploitability": "The CVSS score of 7.1 indicates a moderate\u2011to\u2011high severity; the EPSS score is below 1%, implying a low current exploitation probability, and it is not listed in the CISA KEV catalog. An attacker would need to deliver a crafted URL to a victim or embed it in an iframe; the victim must then view the page for the XSS to execute. The risk is higher if the web interface is publicly accessible, whereas a strictly local deployment limits exposure."}}}}, "created": "2026-02-09T10:50:19.461237+00:00", "updated": "2026-04-17T22:30:29.599911+00:00", "vendors": ["pydantic", "pydantic$PRODUCT$pydantic-ai"]}