Is this vulnerability remotely exploitable?

Yes. If the web UI is accessible over a network (including via port forwarding or exposure from localhost), an attacker can send or publish a crafted URL. Exploitation occurs when a victim's browser loads that URL and the server fetches and serves the attacker-selected content from the CDN.

Does an attacker need authenticated access to exploit this?

Not inherently. The vulnerability is tied to how the `version` parameter is processed for asset loading, not to authentication. However, the impact depends on what data is available to the victim's browser; if sensitive chat history or tokens are only present for authenticated users, the attacker benefits most when the targeted victim is already authenticated in the web UI.

What is the safest general fix pattern?

Constrain and validate the `version` parameter so that it cannot influence directory traversal or arbitrary paths, and ensure that the server only loads UI assets from fixed, known-good locations on the CDN. In practice, that means using a strict allowlist or pattern for version strings and using robust URL/path construction utilities instead of direct string concatenation.

Severity:

HIGH RISK

(7.1)

Path Traversal–Driven Script Injection (CWE-22/CWE-79) in Pydantic AI Web UI CDN Loader

CVE-2026-25640

Published:

Feb 6, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Client-Side Code Injection via Path Traversal

CWE:

CWE-22;CWE-79

Impact:

Arbitrary JavaScript Execution in User Browser (XSS-like Impact)

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Client-Side Code Injection via Path Traversal

CWE:

CWE-22;CWE-79

Impact:

Arbitrary JavaScript Execution in User Browser (XSS-like Impact)

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Path Traversal–Driven Script Injection (CWE-22/CWE-79) in Pydantic AI Web UI CDN Loader

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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