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Python CVE-2026-25640

MEDIUM
Path Traversal (CWE-22)
2026-02-06 security-advisories@github.com GHSA-wjp5-868j-wqv7
Python Path Traversal Pydantic Ai Pydantic
5.4
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Red Hat
7.1 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

5
Severity Changed
Jun 30, 2026 - 03:23 NVD
HIGH MEDIUM
CVSS changed
Jun 30, 2026 - 03:23 NVD
7.1 (HIGH) 5.4 (MEDIUM)
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 06, 2026 - 20:16 nvd
HIGH 7.1

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 pypi packages depend on pydantic-ai (1 direct, 0 indirect)
  • 4 pypi packages depend on pydantic-ai-slim (3 direct, 1 indirect)

Ecosystem-wide dependent count for version 1.34.0 and other introduced versions.

DescriptionNVD

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.

AnalysisAI

Pydantic AI versions 1.34.0 through 1.50.x contain a path traversal vulnerability in the web UI that allows unauthenticated attackers to inject arbitrary JavaScript by manipulating the CDN version parameter in a malicious URL. When a victim visits the crafted link, attacker-controlled code executes in their browser, enabling theft of chat history and other sensitive client-side data. No patch is currently available.

Technical ContextAI

Classified as CWE-22 (Path Traversal). Affects Pydantic Ai. 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

RemediationAI

Fixed in version 1.51.0.. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.

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CVE-2026-25640 vulnerability details – vuln.today
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