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Vulnerability record · CVE-2025-57851 · published 8 April 2026

CVE-2025-57851: Redhat advanced cluster management for kubernetes incorrect default permissions vulnerability

Redhat · Advanced Cluster Management For Kubernetes

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.

6.7 CVSS 3.1 Medium EPSS 0.11% · top 98.7% CWE-276 · Incorrect default permissions
6.7CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2025-57851 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2391104 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-57851), CISA KEV, FIRST EPSS (scores of 2026-10-08). This page is refreshed as NVD updates the record.