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    CVE-2026-87766

    A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0.

    Published:Sep 9, 2026
    Last Modified:Oct 19, 2026
    EPS:Sep 9, 2026
    EPSS Score:0.00151
    CVSS Score:8.8

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Hardened Images
    Vendor
    Redhat
    Product
    Hummingbird
    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-2026:85306
    https://access.redhat.com/errata/RHSA-2026:85308
    https://access.redhat.com/errata/RHSA-2026:85309
    https://access.redhat.com/errata/RHSA-2026:85312
    https://access.redhat.com/errata/RHSA-2026:85313
    https://access.redhat.com/errata/RHSA-2026:85317
    https://access.redhat.com/errata/RHSA-2026:85319
    https://access.redhat.com/errata/RHSA-2026:85322
    https://access.redhat.com/errata/RHSA-2026:85324
    https://access.redhat.com/errata/RHSA-2026:85325
    https://access.redhat.com/security/cve/CVE-2026-87766
    https://bugs.debian.org/1145655
    https://bugzilla.redhat.com/show_bug.cgi?id=2530542
    https://github.com/containers/bubblewrap/releases/tag/v0.12.0
    https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx
    https://www.openwall.com/lists/oss-security/2026/08/27/7
    http://www.openwall.com/lists/oss-security/2026/09/09/3
    http://www.openwall.com/lists/oss-security/2026/09/22/23

    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