BentoML up to 1.4.33 bentofile.yaml path traversal

Summaryinfo

A vulnerability labeled as critical has been found in BentoML up to 1.4.33. This vulnerability affects unknown code of the file bentofile.yaml. Such manipulation of the argument description/docker.setup_script/docker.dockerfile_template/conda.environment_yml leads to path traversal. This vulnerability is traded as CVE-2026-24123. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in BentoML up to 1.4.33. Affected by this issue is an unknown part of the file bentofile.yaml. The manipulation of the argument description/docker.setup_script/docker.dockerfile_template/conda.environment_yml with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to version 1.4.34, BentoML's `bentofile.yaml` configuration allows path traversal attacks through multiple file path fields (`description`, `docker.setup_script`, `docker.dockerfile_template`, `conda.environment_yml`). An attacker can craft a malicious bentofile that, when built by a victim, exfiltrates arbitrary files from the filesystem into the bento archive. This enables supply chain attacks where sensitive files (SSH keys, credentials, environment variables) are silently embedded in bentos and exposed when pushed to registries or deployed. Version 1.4.34 contains a patch for the issue.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-24123 since 01/21/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.4.34 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 84d08cfeb40c5f2ce71b3d3444bbaa0fb16b5ca4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-4723). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• BentoML

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6
• 1.4.7
• 1.4.8
• 1.4.9
• 1.4.10
• 1.4.11
• 1.4.12
• 1.4.13
• 1.4.14
• 1.4.15
• 1.4.16
• 1.4.17
• 1.4.18
• 1.4.19
• 1.4.20
• 1.4.21
• 1.4.22
• 1.4.23
• 1.4.24
• 1.4.25
• 1.4.26
• 1.4.27
• 1.4.28
• 1.4.29
• 1.4.30
• 1.4.31
• 1.4.32
• 1.4.33

License

• open-source

Website

• Product: https://github.com/bentoml/BentoML/

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Once again VulDB remains the best source for vulnerability data.

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