A vulnerability was detected in MosaicML Composer up to 0.32.1. This affects the function tarball.extractall of the file composer/utils/checkpoint.py of the component Checkpoint Extraction. The manipulation results in path traversal.
The attack can be executed remotely. The vendor was contacted early about this disclosure.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
mosaicml:composer
References 6
https://vuldb.com/vuln/416887
VDB-416887 | MosaicML Composer Checkpoint Extraction checkpoint.py tarball.extractall path traversal
https://vuldb.com/vuln/416887/cti
VDB-416887 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/cve/CVE-2026-109153
CVE-2026-109153 | CVE Analysis and Report
https://vuldb.com/submit/978647
Submit #978647 | mosaicml composer 0.32.1 Path Traversal
https://github.com/mosaicml/composer/issues/3942
NVD
https://github.com/mosaicml/composer/
NVD