Description
BentoML is a Python library for building online serving systems optimized for AI apps and model inference. In versions 1.4.38 and prior, the build packaging workflow follows attacker-controlled symlinks inside the build context and copies the referenced file contents into the generated Bento artifact. If a victim builds an untrusted repository or other attacker-supplied build context, the attacker can place a symlink such as loot.txt -> /tmp/outside-marker.txt or a link to a more sensitive local file. When bentoml build runs, BentoML dereferences the symlink and packages the target file contents into the Bento. The leaked file can then propagate further through export, push, or containerization workflows. An attacker can exfiltrate local files from the build host into the Bento artifact, exposing secrets such as cloud credentials, SSH keys, API tokens, environment files, or other sensitive local configurations. Because Bento artifacts are commonly exported, uploaded, stored, or containerized after build, the leaked file contents can spread beyond the original build machine. This issue has been fixed in version 1.4.39.
Published: 2026-05-22
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-mcfx-4vc6-qgxv BentoML has Information Disclosure in `bentoml build` via symlink traversal in the build context
History

Fri, 29 May 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:*

Tue, 26 May 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 22 May 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Bentoml
Bentoml bentoml
Vendors & Products Bentoml
Bentoml bentoml

Fri, 22 May 2026 20:00:00 +0000

Type Values Removed Values Added
Description BentoML is a Python library for building online serving systems optimized for AI apps and model inference. In versions 1.4.38 and prior, the build packaging workflow follows attacker-controlled symlinks inside the build context and copies the referenced file contents into the generated Bento artifact. If a victim builds an untrusted repository or other attacker-supplied build context, the attacker can place a symlink such as loot.txt -> /tmp/outside-marker.txt or a link to a more sensitive local file. When bentoml build runs, BentoML dereferences the symlink and packages the target file contents into the Bento. The leaked file can then propagate further through export, push, or containerization workflows. An attacker can exfiltrate local files from the build host into the Bento artifact, exposing secrets such as cloud credentials, SSH keys, API tokens, environment files, or other sensitive local configurations. Because Bento artifacts are commonly exported, uploaded, stored, or containerized after build, the leaked file contents can spread beyond the original build machine. This issue has been fixed in version 1.4.39.
Title BentoML has Information Disclosure in `bentoml build` via symlink traversal in the build context
Weaknesses CWE-59
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-26T15:33:25.507Z

Reserved: 2026-04-14T14:07:59.642Z

Link: CVE-2026-40610

cve-icon Vulnrichment

Updated: 2026-05-26T15:32:00.662Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-22T20:16:34.760

Modified: 2026-06-17T10:45:31.890

Link: CVE-2026-40610

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-22T21:30:16Z

Weaknesses