PT-2026-31310 · Unknown · Multicluster Engine For Kubernetes

Published 2026-04-08 · Updated 2026-04-12 · CVE-2025-57851

Positive Technologies (AI Summary)

CVSS v3.1

6.7

Medium

Base vector

AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Multicluster Engine for Kubernetes (affected versions not specified)

Description A container privilege escalation flaw exists in certain Multicluster Engine for Kubernetes images. The issue arises from the /etc/passwd file being created with group-writable permissions during the build process. An attacker executing commands within an affected container, even as a non-root user, can exploit their root group membership to modify the /etc/passwd file. This allows the attacker to add a new user with an arbitrary UID, including UID 0, potentially granting full root privileges within the container.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

LPE

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

CVE-2025-57851

Affected Products

Multicluster Engine For Kubernetes

References · 4

• https://bugzilla.redhat.com/show_bug.cgi?id=2391104 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-57851 · Security Note
• https://access.redhat.com/security/cve/CVE-2025-57851 · Vendor Advisory
• https://twitter.com/CVEnew/status/2043295651639763387 · Twitter Post