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    CVE-2026-33747

    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.

    Published:Mar 27, 2026
    Last Modified:Apr 2, 2026
    EPS:Mar 27, 2026
    EPSS Score:0.00055
    CVSS Score:8.4

    Affected Products

    Vendor
    Moby
    Product
    Buildkit
    Vendor
    Mobyproject
    Product
    Buildkit

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-15791 (CVSS 1.8) — A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory…
    CVE-2026-15789 (CVSS 6.9) — A custom client can produce such an upload request to the BuildKit daemon that files can escape from the Build…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High