---
id: CVE-2026-109153
title: A vulnerability was detected in MosaicML Composer up to 0.32.1
summary: >-
  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…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L'
cwe:
  - CWE-22
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T13:29:12.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109153'
references:
  - url: 'https://github.com/mosaicml/composer/'
    label: cna@vuldb.com
  - url: 'https://github.com/mosaicml/composer/issues/3942'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-109153'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/978647'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/416887'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/416887/cti'
    label: cna@vuldb.com
tags:
  - nvd
ingestedAt: '2026-10-13T11:23:51.175Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.