CVE-2025-57851 — Mce: privilege escalation via excessive /etc/passwd permissions
A container privilege escalation flaw was found in certain Multicluster Engine for Kubernetes images. This issue stems from the /etc/passwd file being created with group-writabl…
Published: 2026-04-08 · CVSS: 6.4 · CVSS 3.1
A container privilege escalation flaw was found in certain Multicluster Engine for Kubernetes images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7