CVE-2026-87766

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    CVE-2026-87766

    Published: 9 Sept 2026Last Modified: 11 Sept 2026

    Summary: Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup

    Details: 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.

    References: http://www.openwall.com/lists/oss-security/2026/09/09/3, https://access.redhat.com/downloads/content/package-browser/, https://bugs.debian.org/1145655, https://github.com/containers/bubblewrap/releases/tag/v0.12.0, https://www.openwall.com/lists/oss-security/2026/08/27/7, https://access.redhat.com/security/cve/CVE-2026-87766, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87766.json, https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx, https://nvd.nist.gov/vuln/detail/CVE-2026-87766, https://bugzilla.redhat.com/show_bug.cgi?id=2530542

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -2a76602a8c71f36c1527cf9fc3417d9149822e0c

    Affected versions

    v0.11.2
    v0.11.1
    v0.11.0

    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
    CVE-2026-87766 | CVE-DB