CVE-2026-109153
MosaicML Composer Checkpoint Extraction checkpoint.py tarball.extractall path traversal
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 13, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 12, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X | VulDB |
| 3.1 | 6.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:X/RL:X/RC:C | VulDB |
| 3.0 | 6.3 Medium | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:X/RL:X/RC:C | VulDB |
| 2.0 | 7.5 High | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:ND/RC:C | VulDB |
Weaknesses
- CWE-22 Path Traversal
Affected Products
| Product | Versions |
|---|---|
ComposerMosaicML |
|
References
- VDB-416887 | MosaicML Composer Checkpoint Extraction checkpoint.py tarball.extractall path traversalvdb-entrytechnical-description
- VDB-416887 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- CVE-2026-109153 | CVE Analysis and Reportthird-party-advisory
- Submit #978647 | mosaicml composer 0.32.1 Path Traversalthird-party-advisory
- https://github.com/mosaicml/composer/issues/3942issue-tracking
- https://github.com/mosaicml/composer/product
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