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.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
red hat:red hat enterprise linux 8
red hat:red hat enterprise linux 9
red hat:red hat hardened images
red hat:red hat enterprise linux 10
References 7
https://access.redhat.com/security/cve/CVE-2026-87766
secalert@redhat.com
https://bugs.debian.org/1145655
secalert@redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2530542
secalert@redhat.com
https://github.com/containers/bubblewrap/releases/tag/v0.12.0
secalert@redhat.com
https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx
secalert@redhat.com
https://www.openwall.com/lists/oss-security/2026/08/27/7
secalert@redhat.com
http://www.openwall.com/lists/oss-security/2026/09/09/3
af854a3a-2127-422b-91ae-364da2661108