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

Badges

👾 Exploit Exists🟡 Public PoC

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.

Affected Version(s)

mesop < 1.2.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-33057---Mesop-Unauthenticated-RCE-PoC-and-yara-rules
Created by hackpatato

References

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

EPSS Score

5% chance of being exploited in the next 30 days.

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

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.