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CVE-2026-33057

Mesop-dev Mesop remote code execution

9.8 CRITICALEPSS 4.11%
  1. Published20 Mar 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mesop-dev Mesop< 1.2.3

Remediation

Fixed in
Mesop-dev Mesop≥ 1.2.3

References

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Frequently asked

Is CVE-2026-33057 being actively exploited?

CVE-2026-33057 is not in the CISA KEV catalog. Its EPSS exploit probability is 4.11%.

How severe is CVE-2026-33057?

CVE-2026-33057 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 4.11% probability of exploitation.

Which products are affected by CVE-2026-33057?

Affected products include Mesop-dev Mesop.

How do I fix CVE-2026-33057?

Upgrade affected software to a fixed version, for example Mesop-dev Mesop 1.2.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33057 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.