CVE-2026-3012
Samba: group policy certificate enrollment uses http:// without validation
Description
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.
INFO
Published Date :
May 27, 2026, 11:16 a.m.
Last Modified :
June 15, 2026, 10:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-3012
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Disable certificate auto-enrollment if not required.
- Ensure certificate authority transport is encrypted.
- Apply patches from Samba vendor.
- Configure secure Group Policy handling.
Public PoC/Exploit Available at Github
CVE-2026-3012 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3012.
| URL | Resource |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:22644 | Issue Tracking |
| https://access.redhat.com/errata/RHSA-2026:22963 | Issue Tracking |
| https://access.redhat.com/errata/RHSA-2026:25049 | |
| https://access.redhat.com/errata/RHSA-2026:25979 | |
| https://access.redhat.com/security/cve/CVE-2026-3012 | Mitigation Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2447319 | Issue Tracking Third Party Advisory |
| https://bugzilla.samba.org/show_bug.cgi?id=16003 | Issue Tracking Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3012 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3012
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
DSA and DLA for Debian last 14 days
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3012 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3012 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 15, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:25979 -
CVE Modified by [email protected]
Jun. 10, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:25049 -
Reanalysis by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.1.0 OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.16.0 up to (excluding) 4.21.0 Changed Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-3012 Types: Mitigation, Vendor Advisory Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-3012 Types: Mitigation, Third Party Advisory Changed Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2447319 Types: Issue Tracking, Vendor Advisory Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2447319 Types: Issue Tracking, Third Party Advisory -
Initial Analysis by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.1.0 Added Reference Type Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:22644 Types: Issue Tracking Added Reference Type Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:22963 Types: Issue Tracking Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-3012 Types: Mitigation, Vendor Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2447319 Types: Issue Tracking, Vendor Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.samba.org/show_bug.cgi?id=16003 Types: Issue Tracking, Mitigation, Vendor Advisory -
CVE Modified by [email protected]
Jun. 04, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:22963 -
CVE Modified by [email protected]
Jun. 03, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:22644 -
CVE Modified by [email protected]
May. 27, 2026
Action Type Old Value New Value Added CWE CWE-345 -
New CVE Received by [email protected]
May. 27, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Added Reference https://access.redhat.com/security/cve/CVE-2026-3012 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2447319 Added Reference https://bugzilla.samba.org/show_bug.cgi?id=16003