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CVE-2026-33747— BuildKit vulnerable to malicious frontend causing file escape outside of storage root

Quick assessment

Affected
moby buildkit
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BuildKit是Moby开源的一个并发、高速缓存高效的构建器工具包。 BuildKit 0.28.1之前版本存在路径遍历漏洞，该漏洞源于自定义BuildKit前端可能构造API消息导致文件写入执行环境之外，可能导致任意文件写入。

CVSS 8.4 · High EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-33747

Vulnerability Information
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Vulnerability Title
BuildKit vulnerable to malicious frontend causing file escape outside of storage root
Source: CVE Program / CVE List V5
Vulnerability Description
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
BuildKit 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BuildKit是Moby开源的一个并发、高速缓存高效的构建器工具包。 BuildKit 0.28.1之前版本存在路径遍历漏洞，该漏洞源于自定义BuildKit前端可能构造API消息导致文件写入执行环境之外，可能导致任意文件写入。
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 < 0.28.1 -

II. Public POCs for CVE-2026-33747

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9297 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-33747

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Patches & Fixes for CVE-2026-33747 (1)

Vendor Advisories for CVE-2026-33747 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-33747

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