VulnerabilityAnalyzed

CVE-2026-33057

Mesop is a Python-based UI framework that allows users to build web applications.

CRITICAL 9.8EPSS 5.29%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (5.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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.

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 5.29% probability · 92th percentile
CISA KEV: Not listed
Weakness: CWE-94
Affected: mesop-dev/mesop
Source: security-advisories@github.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.