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CVE-2026-40610— BentoML has Information Disclosure in `bentoml build` via symlink traversal in the build context

Quick assessment

Affected
bentoml BentoML
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.

BentoML是BentoML开源的一个开源模型服务库。用于使用 Python 构建高性能和可扩展的人工智能应用程序。 BentoML 1.4.38及之前版本存在后置链接漏洞，该漏洞源于构建打包工作流遵循攻击者控制的符号链接，可能导致本地文件泄露。以下版本受到影响：1.4.38及之前版本。

CVSS 5.5 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
bentoml BentoML < 1.4.39 affected
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I. Basic Information for CVE-2026-40610

Vulnerability Information
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Vulnerability Title
BentoML has Information Disclosure in `bentoml build` via symlink traversal in the build context
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
BentoML 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BentoML是BentoML开源的一个开源模型服务库。用于使用 Python 构建高性能和可扩展的人工智能应用程序。 BentoML 1.4.38及之前版本存在后置链接漏洞，该漏洞源于构建打包工作流遵循攻击者控制的符号链接，可能导致本地文件泄露。以下版本受到影响：1.4.38及之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bentoml BentoML < 1.4.39 -

II. Public POCs for CVE-2026-40610

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III. Intelligence Information for CVE-2026-40610

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Patches & Fixes for CVE-2026-40610 (1)

Vendor Advisories for CVE-2026-40610 (1)

Vendor Pages for CVE-2026-40610 (1)

IV. Related Vulnerabilities

Same product: BentoML
Same vendor: bentoml
Same weakness: CWE-59

V. Comments for CVE-2026-40610

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