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CVE-2025-8766 Red Hat CVE debrief

A container privilege escalation flaw was found in certain Multi-Cloud Object Gateway Core 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.

Vendor
Red Hat
Product
Red Hat Openshift Data Foundation 4
CVSS
MEDIUM 6.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-13
Original CVE updated
2026-07-15
Advisory published
2026-03-13
Advisory updated
2026-07-15

Who should care

Users of Redhat Openshift Data Foundation 4.0

Technical summary

The /etc/passwd file is created with group-writable permissions during build time. An attacker who can execute commands within an affected container can leverage their membership in the root group to modify the /etc/passwd file.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches and updates provided by Redhat to address the vulnerability.
  • Restrict access to affected containers to only trusted users.
  • Monitor container logs for suspicious activity.

Evidence notes

The CVE-2025-8766 record was published on 2026-03-13T19:53:56.157Z and last modified on 2026-06-05T19:54:17.780Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-8766 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-8766

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-8766 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-8766

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.