RHSA-2026:85309 — Security Advisory

An update for bubblewrap is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.