PT-2026-52100 · Mosaicml · Mosaicml Composer

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-10043

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions MosaicML Composer (affected versions not specified)

Description An issue exists in the parsing of checkpoints due to improper validation of user-supplied data, leading to the deserialization of untrusted data. This allows remote attackers to execute arbitrary code in the context of the current process. Exploitation requires user interaction, such as visiting a malicious page or opening a malicious file.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-10043

ZDI-26-384

Affected Products

Mosaicml Composer

References · 3

• https://github.com/mosaicml/composer/commit/6405188805a0054b4551ec49e4919c54c971d0e8 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-10043 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-26-384 · Security Note