CVE-2026-3012

What it is

A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of data exposure, data tampering.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-27 11:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-04 23:17 UTC Last updatedMost recent change to the record

Details

Published

2026-05-27 11:16 UTC

Last modified

2026-11-04 23:17 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-345

Record status

Modified

Affected

• Redhat Openshift Container Platform 4.0
• Samba < 4.21.0
• Redhat Enterprise Linux 7.0
• Redhat Enterprise Linux 9.0

Attack profile CVSS 3.1 · 8.0

Attack vector

Adjacent network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None