CVE-2026-10043CWE-502

MosaicML Composer Deserialization of Untrusted Data Remote Code Execution Vulnerability

High · published June 24, 2026

CVSS v3.0
7.8
EPSS
1%
Percentile
45.0
In the wild
Unconfirmed
What it is

MosaicML Composer Deserialization of Untrusted Data Remote Code Execution Vulnerability. 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 specific flaw exists within the parsing of checkpoints. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27990.

The record
Technical detail
CVSS v3.0
7.8 · HIGH
Vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00547 · 45.0th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-06-24T21:36Z
EPSS history
Timeline
  • 24 JUN 21:36Z
    MosaicML Composer Deserialization of Untrusted Data Remote Code Execution Vulnerability
    cvelistv5