Issued at: 2026-10-21
Updated at: 2026-10-21
Advisory content derived from Red Hat RHSA-2026:85306, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: bubblewrap security update
Description
Bubblewrap (/usr/bin/bwrap) is a core execution engine for unprivileged containers that works as a setuid binary on kernels without user namespaces.
Security Fix(es):
* bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup (CVE-2026-87766)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.