Unrestricted Remote Code Execution in Mesop Python Framework
CVE-2026-33057

9.8CRITICAL

Key Information:

Vendor

Mesop-dev

Status
Mesop
Vendor
CVE Published:
20 March 2026

What is CVE-2026-33057?

The Mesop UI framework, used for building web applications, contains a significant vulnerability in its ai/testing module. This flaw permits the ingestion of untrusted Python code without any authentication measures, leading to Unrestricted Remote Code Execution. By exploiting the /exec-py endpoint, malicious users can send base64 encoded payloads that are executed directly, granting control over the host machine. This critical issue is present in versions 1.2.2 and earlier, highlighting the importance of upgrading to version 1.2.3, which includes a fix.

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Deploy the Patch

Affected Version(s)

mesop < 1.2.3

References

https://github.com/mesop-dev/mesop/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/mesop-dev/mesop/commit/825f55970c20686...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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