Path traversal in MosaicML Composer checkpoint extraction
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
MosaicML Composer up to 0.32.1 has a path traversal flaw (CWE-22) in the function tarball.extractall of the checkpoint extraction component. A remote attacker without privileges can trigger it, but a user must take part in the attack. The CVSS vector rates the impact on confidentiality, integrity and availability as low.
Written with Claude Haiku 5.5 from the sources below · 2026-10-27
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for MosaicML Composer.
Written with Claude Haiku 5.5 from the sources below · 2026-10-27
Timeline
- 2026-10-13 Threatist record created from CVE-2026-109153
- 2026-10-16 CISA SSVC decision points changed
References
More MosaicML vulnerabilities
- TI-2026-08802 Deserialization of untrusted data in MosaicML Composer CVSS 3.0HIGH 7.8
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences