ZDI-CAN-27990: ZDI-26-384: MosaicML Composer Deserialization of Untrusted Data Remote Code Execution Vulnerability

Published Jun 24, 2026

Updated

This vulnerability allows remote attackers to execute arbitrary code on affected installations of MosaicML Composer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-10043.

Affected Software

1 affected component

MosaicML Composer

Event History

Jun 24, 2026

Advisory Published

via ZDI·05:00 AM

Data Sourced

via ZDI·05:00 AM

Description

Frequently Asked Questions

What is the severity of ZDI-CAN-27990?

The severity of ZDI-CAN-27990 is rated at 7.8 according to the CVSS scoring system.

How do I fix ZDI-CAN-27990?

To fix ZDI-CAN-27990, users should apply the latest patches provided by MosaicML for MosaicML Composer.

What type of vulnerability is ZDI-CAN-27990?

ZDI-CAN-27990 is a deserialization of untrusted data vulnerability that can lead to remote code execution.

What are the requirements for exploiting ZDI-CAN-27990?

Exploitation of ZDI-CAN-27990 requires user interaction, such as visiting a malicious page or opening a malicious file.

What software is affected by ZDI-CAN-27990?

ZDI-CAN-27990 affects MosaicML Composer installations.