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CVE-2026-15788— WCOW cache mount source selector resolves NTFS junctions outside of cache root

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之前版本存在后置链接漏洞，该漏洞源于Windows容器上的缓存挂载无法检测NTFS目录连接点，可能导致不可信用户在WCOW配置的BuildKit守护进程上读取任意主机文件。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.41% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby BuildKit < 0.31.2 affected
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I. Basic Information for CVE-2026-15788

Vulnerability Information
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Vulnerability Title
WCOW cache mount source selector resolves NTFS junctions outside of cache root
Source: CVE Program / CVE List V5
Vulnerability Description
BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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
Moby BuildKit 后置链接漏洞
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之前版本存在后置链接漏洞，该漏洞源于Windows容器上的缓存挂载无法检测NTFS目录连接点，可能导致不可信用户在WCOW配置的BuildKit守护进程上读取任意主机文件。
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-2026-15788

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III. Intelligence Information for CVE-2026-15788

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Vendor Advisories for CVE-2026-15788 (1)

IV. Related Vulnerabilities

Same product: BuildKit
Same vendor: moby
Same weakness: CWE-59

V. Comments for CVE-2026-15788

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