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CVE-2026-15789— Malicious client can bypass destination directory validation on local sources upload

Quick assessment

Affected
moby BuildKit
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.

Moby BuildKit是Moby团队开源的一个并发、高速缓存高效的构建器工具包。 Moby BuildKit 0.31.2之前版本存在路径遍历漏洞，该漏洞源于上传请求导致文件逃逸出BuildKit控制的状态目录，可能允许具有有效权限的客户端绕过身份验证并访问BuildKit控制API。

AI Predicted 8.8 Difficulty: Easy EPSS 0.31% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby BuildKit < 0.31.2 affected
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I. Basic Information for CVE-2026-15789

Vulnerability Information
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Vulnerability Title
Malicious client can bypass destination directory validation on local sources upload
Source: CVE Program / CVE List V5
Vulnerability Description
A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
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
Vulnerability Title
Moby BuildKit 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Moby BuildKit是Moby团队开源的一个并发、高速缓存高效的构建器工具包。 Moby BuildKit 0.31.2之前版本存在路径遍历漏洞，该漏洞源于上传请求导致文件逃逸出BuildKit控制的状态目录，可能允许具有有效权限的客户端绕过身份验证并访问BuildKit控制API。
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
moby BuildKit 0 ~ 0.31.2 -

II. Public POCs for CVE-2026-15789

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III. Intelligence Information for CVE-2026-15789

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Vendor Advisories for CVE-2026-15789 (1)

Same Patch Batch · moby · 2026-07-21 · 4 CVEs total

CVE-2026-15792 Possible panic when incorrect parameters sent from frontend
CVE-2026-15793 Git source checkout from a bundle file could lead to command injection
CVE-2026-15791 LLB file operation can be tricked to remove /tmp directory contents

IV. Related Vulnerabilities

Same product: BuildKit
Same vendor: moby
Same weakness: CWE-22

V. Comments for CVE-2026-15789

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