CVE Feed

    Dashboard / CVE / CVE-2026-121520

    CVE-2026-121520

    In BuildKit versions prior to v0.34.1, a malicious client with access to the BuildKit control APIs can submit a build request that sets an extended attribute on a file outside the BuildKit state directory. Extended attributes in the trusted. or security. namespaces may also be set, potentially giving a program on the host elevated privileges. This issue affects build services that accept build requests from untrusted users. The issue is fixed in v0.34.1.

    Published:Nov 3, 2026
    Last Modified:Nov 4, 2026
    EPS:Nov 3, 2026
    EPSS Score:
    CVSS Score:4.5

    Affected Products

    Vendor
    Moby
    Product
    Buildkit

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-27 Leveraging Race Conditions via Symbolic Links

    Related CVEs

    CVE-2026-121522 (CVSS 6.7) — In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same …
    CVE-2026-93321 (CVSS 6.9) — A malicious frontend can submit an LLB definition that causes buildkitd to panic and terminate, interrupting a…
    CVE-2026-93315 (CVSS 5.8) — When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may …
    CVE-2026-93326 (CVSS 6) — A build step for a Git source, crafted in a specific way, can bypass some policy validation rules. A malicious…
    CVE-2026-93323 (CVSS 6.8) — The Dockerfile frontend loaded the Dockerfile and .dockerignore files of a build context into memory without a…
    CVE-2026-93322 (CVSS 6.9) — A malicious frontend can submit an LLB definition that causes buildkitd to panic and terminate, interrupting a…
    CVE-2026-93320 (CVSS 6) — BuildKit may be tricked into performing file actions with special file inodes where regular files are expected…
    CVE-2026-93319 (CVSS 5.7) — A malicious external BuildKit frontend can send requests using the internal API that can create conditions for…
    CVE-2026-93318 (CVSS 7.5) — A malicious image can advertise DiffIDs from another image while containing different layer contents. In affec…
    CVE-2026-93317 (CVSS 5.9) — An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that …

    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