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CVE-2026-109153— MosaicML Composer Checkpoint Extraction checkpoint.py tarball.extractall path traversal

Quick assessment

Affected
MosaicML Composer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 MosaicML Composer 0.32.1 及更早版本中检测到一处漏洞。该漏洞影响 Checkpoint Extraction 组件中 composer/utils/checkpoint.py 文件里的 tarball.extractall 函数。攻击者通过构造恶意操作可引发路径遍历问题。此漏洞可被远程利用。供应商已在此披露前早期获知该安全问题。

CVSS 6.3 · Medium EPSS 0.49% · P41

Affected Version Matrix 2

VendorProduct Version RangeStatus
MosaicML Composer 0.32.0 affected
0.32.1 affected
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I. Basic Information for CVE-2026-109153

Vulnerability Information
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Vulnerability Title
MosaicML Composer Checkpoint Extraction checkpoint.py tarball.extractall path traversal
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MosaicML Composer 0.32.0 cpe:2.3:a:mosaicml:composer:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-109153

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III. Intelligence Information for CVE-2026-109153

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Other References for CVE-2026-109153 (2)

IV. Related Vulnerabilities

Same product: Composer
Same vendor: MosaicML
Same weakness: CWE-22

V. Comments for CVE-2026-109153

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