Threats affecting pkg:github/containers/bubblewrap

CVE-2026-87766 is a high severity vulnerability in bubblewrap used by Red Hat Enterprise Linux 10. It involves improper link resolution during sandbox setup, allowing symlink traversal via /oldroot. This flaw can cause files or directories to be created outside the sandbox with the launching user's privileges before the sandboxed process starts. The issue is fixed in bubblewrap version 0.12.0.

bubblewrap is a low-level unprivileged sandboxing tool. From version 0.11.0 to before version 0.11.2, if bubblewrap is installed in setuid mode then the user can use ptrace to attach to bubblewrap and control the unprivileged part of the sandbox setup phase. This allows the attacker to arbitrarily use the privileged operations, and in particular the "overlay mount" operation, allowing the creation of overlay mounts which is otherwise not allowed in the setuid version of bubblewrap. This issue has been patched in version 0.11.2.