CVE-2026-3012

Samba: group policy certificate enrollment uses http:// without validation

State: Published
Severity: 8.0 High
Published: May 27, 2026
Updated: Oct 15, 2026
Reserved: Feb 23, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.0 High	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N	redhat
3.1	8.0 High	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N	redhat-SADP

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:4.23.5-109.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:4.21.3-114.el10_0.1 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:4.19.4-16.el8_10 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:4.19.4-16.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:4.15.5-16.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:4.15.5-16.el8_6.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:4.17.5-7.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:4.17.5-7.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:4.23.5-10.el9_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:4.23.5-10.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:4.17.5-105.el9_2.5 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:4.19.4-105.el9_4.4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:4.21.3-14.el9_6.1 and laterNot affected
Red Hat OpenShift Container Platform 4.12Red Hat	412.86.202608241157-0 and laterNot affected
Red Hat OpenShift Container Platform 4.12Red Hat	412.86.202609082051-0 and laterNot affected
Red Hat OpenShift Container Platform 4.13Red Hat	413.92.202609080414-0 and laterNot affected
Red Hat OpenShift Container Platform 4.13Red Hat	413.92.202609302032-0 and laterNot affected
Red Hat OpenShift Container Platform 4.14Red Hat	414.92.202608172040-0 and laterNot affected
Red Hat OpenShift Container Platform 4.14Red Hat	414.92.202609011250-0 and laterNot affected
Red Hat OpenShift Container Platform 4.15Red Hat	415.92.202608180329-0 and laterNot affected
Red Hat OpenShift Container Platform 4.15Red Hat	415.92.202609140326-0 and laterNot affected
Red Hat OpenShift Container Platform 4.16Red Hat	416.94.202608150307-0 and laterNot affected
Red Hat OpenShift Container Platform 4.16Red Hat	416.94.202609011112-0 and laterNot affected
Red Hat OpenShift Container Platform 4.17Red Hat	417.94.202608250221-0 and laterNot affected
Red Hat OpenShift Container Platform 4.17Red Hat	417.94.202609191027-0 and laterNot affected
Red Hat OpenShift Container Platform 4.18Red Hat	418.94.202608142238-0 and laterNot affected
Red Hat OpenShift Container Platform 4.18Red Hat	418.94.202609031320-0 and laterNot affected
Red Hat OpenShift Container Platform 4.19Red Hat	4.19.9.6.202606241344-0 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat

References

RHSA-2026:22644vendor-advisory
RHSA-2026:22963vendor-advisory
RHSA-2026:25049vendor-advisory
RHSA-2026:25979vendor-advisory
RHSA-2026:28053vendor-advisory
RHSA-2026:28054vendor-advisory
RHSA-2026:28055vendor-advisory
RHSA-2026:28056vendor-advisory
RHSA-2026:28057vendor-advisory
RHSA-2026:29863vendor-advisory
RHSA-2026:56786vendor-advisory
RHSA-2026:56853vendor-advisory
RHSA-2026:56911vendor-advisory
RHSA-2026:57483vendor-advisory
RHSA-2026:59831vendor-advisory
RHSA-2026:60019vendor-advisory
RHSA-2026:62409vendor-advisory
RHSA-2026:62549vendor-advisory
RHSA-2026:65839vendor-advisory
RHSA-2026:65851vendor-advisory
RHSA-2026:65907vendor-advisory
RHSA-2026:67857vendor-advisory
RHSA-2026:70586vendor-advisory
RHSA-2026:77320vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-3012vdb-entry
RHBZ#2447319issue-tracking
https://bugzilla.samba.org/show_bug.cgi?id=16003
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3012.json

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