mesop-dev mesop up to 1.2.2 ai/sandbox/wsgi_app.py wsgi_app code injection

Summaryinfo

A vulnerability was found in mesop-dev mesop up to 1.2.2. It has been rated as critical. The affected element is the function wsgi_app of the file ai/sandbox/wsgi_app.py. The manipulation leads to code injection. This vulnerability is referenced as CVE-2026-33057. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in mesop-dev mesop up to 1.2.2 and classified as critical. This issue affects the function wsgi_app of the file ai/sandbox/wsgi_app.py. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Mesop is a Python-based UI framework that allows users to build web applications. In versions 1.2.2 and below, an explicit web endpoint inside the ai/ testing module infrastructure directly ingests untrusted Python code strings unconditionally without authentication measures, yielding standard Unrestricted Remote Code Execution. Any individual capable of routing HTTP logic to this server block will gain explicit host-machine command rights. The AI codebase package includes a lightweight debugging Flask server inside ai/sandbox/wsgi_app.py. The /exec-py route accepts base_64 encoded raw string payloads inside the code parameter natively evaluated by a basic POST web request. It saves it rapidly to the operating system logic path and injects it recursively using execute_module(module_path...). This issue has been fixed in version 1.2.3.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-33057 since 03/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 1.2.3 eliminates this vulnerability.

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Productinfo

Vendor

• mesop-dev

Name

• mesop

Version

• 1.2.0
• 1.2.1
• 1.2.2

Website

• Product: https://github.com/mesop-dev/mesop/

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