UBUNTU-CVE-2026-121542

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    UBUNTU-CVE-2026-121542

    Published: 3 Nov 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-121542

    Summary:

    Details: In Docker Buildx versions v0.19.0 through v0.38.0, an untrusted Bake definition may expose files accessible to the Buildx client without the expected fs.read approval. Under certain conditions, paths under the same parent directory as the current working directory whose names use the working directory's basename as a prefix can skip the filesystem entitlement check. Exploitation requires specific matching filenames next to the current project directory. Users who run untrusted Bake definitions may be affected. The issue is fixed in v0.38.1.

    References: https://ubuntu.com/security/CVE-2026-121542, https://www.cve.org/CVERecord?id=CVE-2026-121542, https://github.com/docker/buildx/security/advisories/GHSA-rghq-x9hf-hc3r

    Affected packages

    Package

    Name: docker.io

    Purl: pkg:deb/ubuntu/docker.io?arch=source&distro=esm-infra%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.6.2~dfsg1-1ubuntu4

    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
    UBUNTU-CVE-2026-121542 | CVE-DB