Taipy 4.1.1 Path Traversal Vulnerability (CVE-2026-48544)

Taipy is vulnerable to a path traversal flaw, identified as CVE-2026-48544, affecting version 4.1.1. The vulnerability exists in the ElementLibrary.get_resource() method within the taipy/gui/extension/library.py file. This vulnerability enables unauthenticated attackers to bypass intended directory restrictions, potentially leading to the exposure of sensitive files. The root cause lies in an insufficient path containment check that utilizes str.startswith() without enforcing a trailing path separator, allowing attackers to craft malicious GET requests with path traversal sequences to access files outside the intended library directory. Successful exploitation could result in the unauthorized disclosure of application source code, configuration files, or other sensitive data.

Attack Chain

1. The attacker identifies a Taipy 4.1.1 instance running a web application.
2. The attacker crafts a malicious GET request targeting the ElementLibrary.get_resource() endpoint.
3. The crafted GET request includes path traversal sequences (e.g., ../) in the resource path.
4. The flawed str.startswith() check in ElementLibrary.get_resource() fails to properly sanitize the path due to the absence of a trailing path separator.
5. Flask’s path converter and Werkzeug’s WSGI layer preserve the traversal segments.
6. The server resolves the manipulated path, allowing access to files outside the intended library directory.
7. The attacker retrieves sensitive files, such as application source code or configuration files.

Impact

Successful exploitation of this path traversal vulnerability (CVE-2026-48544) allows unauthenticated attackers to read arbitrary files on the server hosting the vulnerable Taipy application. This unauthorized file access can lead to the disclosure of sensitive information, including application source code, configuration files containing credentials, or internal documentation. The severity of the impact depends on the nature of the exposed files and the attacker’s ability to leverage this information for further malicious activities.

Recommendation

• Upgrade to a patched version of Taipy that includes commit 129fd40 which addresses CVE-2026-48544.
• Deploy the Sigma rule Detect CVE-2026-48544 Exploitation — Taipy Path Traversal to your SIEM to detect exploitation attempts based on suspicious URI patterns.
• Implement web application firewall (WAF) rules to filter out requests containing path traversal sequences targeting the ElementLibrary.get_resource() endpoint.
• Regularly review and update input validation and sanitization routines to prevent path traversal vulnerabilities in other parts of the application.