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    CVE-2026-86320

    A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true. An attacker who can provide a malicious source containing a Git post-applypatch hook can cause the hook to execute on the host during the build process, resulting in arbitrary code execution with the privileges of the user running flatpak-builder.

    Published:Sep 17, 2026
    Last Modified:Oct 30, 2026
    EPS:Sep 17, 2026
    EPSS Score:0.00288
    CVSS Score:7.8

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

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    References

    https://access.redhat.com/errata/RHSA-2026:80495
    https://access.redhat.com/errata/RHSA-2026:80496
    https://access.redhat.com/errata/RHSA-2026:80973
    https://access.redhat.com/errata/RHSA-2026:84832
    https://access.redhat.com/errata/RHSA-2026:84833
    https://access.redhat.com/errata/RHSA-2026:84834
    https://access.redhat.com/errata/RHSA-2026:84842
    https://access.redhat.com/errata/RHSA-2026:86714
    https://access.redhat.com/errata/RHSA-2026:90896
    https://access.redhat.com/errata/RHSA-2026:92220
    https://access.redhat.com/security/cve/CVE-2026-86320
    https://bugzilla.redhat.com/show_bug.cgi?id=2471023
    https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv
    https://bugzilla.redhat.com/show_bug.cgi?id=2471023
    https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv

    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