CVE-2026-10043

HIGH 7.8

MosaicML Composer Deserialization of Untrusted Data Remote Code Execution Vulnerability

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-502
Vendor	mosaicml
Product	composer
Published	Jun 24, 2026

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CVSS v3 Breakdown

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Versions

MosaicML / Composer

0.32.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

zerodayinitiative.com: https://www.zerodayinitiative.com/advisories/ZDI-26-384/ github.com: https://github.com/mosaicml/composer/commit/6405188805a0054b4551ec49e4919c54c971d0e8