CVE-2026-87766
Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup
CVSS Score
8.8
EPSS Score
0.2%
EPSS Percentile
4th
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.
| CWE | CWE-59 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Sep 9, 2026 |
| Last Updated | Oct 19, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Hardened Images
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85306 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85308 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85309 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85312 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85313 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85317 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85319 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85322 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85324 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85325 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-87766 bugs.debian.org: https://bugs.debian.org/1145655 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2530542 github.com: https://github.com/containers/bubblewrap/releases/tag/v0.12.0 github.com: https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx openwall.com: https://www.openwall.com/lists/oss-security/2026/08/27/7 openwall.com: http://www.openwall.com/lists/oss-security/2026/09/09/3 openwall.com: http://www.openwall.com/lists/oss-security/2026/09/22/23
Credits
Red Hat would like to thank geeknik for reporting this issue.