Name: CVE-2026-3012: Insufficient Verification of Data Authenticity
Creator: Rapid7
Published: 2026-05-27T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-3012, CWE-345, CVSS 8, EPSS 0.00227

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.

CVSS Details

CVSS 3.1 Base Score: 8
CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade python3-ldbUpgrade samba-winbind-modulesUpgrade libnetapiUpgrade samba-winbind-krb5-locatorUpgrade libwbclient-develUpgrade samba-dcerpcUpgrade samba-usersharesUpgrade samba-krb5-printingUpgrade libldb-develUpgrade python3-sambaUpgrade samba-common-toolsUpgrade python3-samba-develUpgrade samba-ldb-ldap-modulesUpgrade libsmbclient-develUpgrade samba-libsUpgrade samba-testUpgrade samba-client-libsUpgrade libsmbclientUpgrade libwbclientUpgrade samba-vfs-iouringUpgrade libnetapi-develUpgrade samba-winbind-clientsUpgrade python3-samba-testUpgrade samba-pidlUpgrade samba-develUpgrade samba-winexeUpgrade libldbUpgrade samba-test-libsUpgrade samba-toolsUpgrade samba-common-libsUpgrade samba-gpupdateUpgrade sambaUpgrade samba-clientUpgrade samba-commonUpgrade python3-samba-dcUpgrade ldb-toolsUpgrade samba-winbindUpgrade ctdbUpgrade samba-dc-libs	Jun 3, 2026	Jun 2, 2026
Alpine Linux	—	Upgrade samba	May 29, 2026	May 27, 2026
Amazon_linux_2023	—	Upgrade samba-dcerpcUpgrade libwbclient-develUpgrade samba-client-libs-debuginfoUpgrade samba-debugsourceUpgrade libsmbclient-debuginfoUpgrade samba-winbind-modulesUpgrade samba-common-libs-debuginfoUpgrade samba-pidlUpgrade samba-commonUpgrade libsmbclientUpgrade samba-winbind-clientsUpgrade samba-test-libsUpgrade python3-samba-testUpgrade samba-vfs-iouring-debuginfoUpgrade libnetapi-develUpgrade samba-test-libs-debuginfoUpgrade libwbclient-debuginfoUpgrade samba-dc-libsUpgrade samba-dc-libs-debuginfoUpgrade samba-toolsUpgrade samba-common-libsUpgrade libnetapi-debuginfoUpgrade python3-samba-dc-debuginfoUpgrade samba-ldb-ldap-modules-debuginfoUpgrade samba-debuginfoUpgrade samba-common-tools-debuginfoUpgrade python3-samba-develUpgrade python3-sambaUpgrade samba-usersharesUpgrade samba-client-libsUpgrade samba-winbind-debuginfoUpgrade samba-develUpgrade samba-krb5-printingUpgrade samba-client-debuginfoUpgrade samba-clientUpgrade samba-winbindUpgrade samba-winbind-krb5-locator-debuginfoUpgrade samba-winbind-krb5-locatorUpgrade sambaUpgrade libnetapiUpgrade samba-testUpgrade samba-krb5-printing-debuginfoUpgrade samba-winbind-clients-debuginfoUpgrade samba-test-debuginfoUpgrade samba-libs-debuginfoUpgrade libwbclientUpgrade samba-winbind-modules-debuginfoUpgrade samba-libsUpgrade samba-vfs-iouringUpgrade python3-samba-dcUpgrade samba-common-toolsUpgrade python3-samba-debuginfoUpgrade samba-dcerpc-debuginfoUpgrade samba-ldb-ldap-modulesUpgrade libsmbclient-devel	Jul 8, 2026	May 27, 2026
Debian	—	Upgrade samba	May 27, 2026	May 27, 2026
Oracle_linux	—	Upgrade samba-client-libsUpgrade libwbclientUpgrade samba-vfs-glusterfsUpgrade samba-pidlUpgrade samba-krb5-printingUpgrade samba-toolsUpgrade samba-ldb-ldap-modulesUpgrade samba-test-libsUpgrade samba-testUpgrade python3-samba-develUpgrade libnetapi-develUpgrade python3-sambaUpgrade ctdbUpgrade samba-usersharesUpgrade samba-vfs-iouringUpgrade samba-develUpgrade samba-libsUpgrade samba-commonUpgrade samba-clientUpgrade samba-winbind-modulesUpgrade samba-common-libsUpgrade libsmbclientUpgrade sambaUpgrade python3-samba-testUpgrade samba-winbind-krb5-locatorUpgrade samba-dcerpcUpgrade samba-winbindUpgrade samba-dc-libsUpgrade samba-common-toolsUpgrade python3-samba-dcUpgrade libsmbclient-develUpgrade samba-winbind-clientsUpgrade libwbclient-develUpgrade libnetapiUpgrade samba-winexe	Jun 5, 2026	May 27, 2026
Redhat Openshift	—	Upgrade ose-rhel-coreos	Aug 10, 2026	May 27, 2026
Redhat_linux	—	Upgrade samba-common-libsUpgrade samba-winbind-modulesUpgrade samba-vfs-iouringUpgrade ctdbUpgrade ctdb-debuginfoUpgrade libsmbclient-debuginfoUpgrade samba-winbind-clients-debuginfoUpgrade samba-common-toolsUpgrade samba-commonUpgrade samba-ldb-ldap-modulesUpgrade samba-usersharesUpgrade samba-winexeUpgrade ldb-tools-debuginfoUpgrade python3-samba-dcUpgrade python3-samba-testUpgrade samba-client-libsUpgrade libnetapiUpgrade samba-dc-libsUpgrade samba-libs-debuginfoUpgrade samba-toolsUpgrade libwbclient-develUpgrade samba-winbindUpgrade samba-dcerpc-debuginfoUpgrade samba-debuginfoUpgrade samba-winbind-modules-debuginfoUpgrade libsmbclient-develUpgrade libldb-debuginfoUpgrade samba-client-libs-debuginfoUpgrade samba-client-debuginfoUpgrade samba-dc-libs-debuginfoUpgrade samba-winbind-clientsUpgrade sambaUpgrade samba-winbind-debuginfoUpgrade samba-clientUpgrade libldb-develUpgrade samba-dcerpcUpgrade samba-develUpgrade samba-libsUpgrade samba-krb5-printing-debuginfoUpgrade samba-winbind-krb5-locatorUpgrade samba-vfs-iouring-debuginfoUpgrade libsmbclientUpgrade libnetapi-develUpgrade python3-samba-develNo solution existsUpgrade samba-test-libsUpgrade python3-samba-debuginfoUpgrade samba-common-libs-debuginfoUpgrade samba-winexe-debuginfoUpgrade samba-ldb-ldap-modules-debuginfoUpgrade samba-testUpgrade python3-samba-dc-debuginfoUpgrade samba-gpupdateUpgrade ldb-toolsUpgrade libwbclient-debuginfoUpgrade python3-ldb-debuginfoUpgrade samba-test-libs-debuginfoUpgrade python3-sambaUpgrade samba-debugsourceUpgrade libnetapi-debuginfoUpgrade libwbclientUpgrade libldbUpgrade python3-ldbUpgrade samba-test-debuginfoUpgrade samba-krb5-printingUpgrade samba-pidlUpgrade samba-common-tools-debuginfoUpgrade samba-winbind-krb5-locator-debuginfo	Jun 4, 2026	May 27, 2026
Rocky_linux	—	Upgrade samba-krb5-printingUpgrade samba-test-debuginfoUpgrade sambaUpgrade samba-ldb-ldap-modulesUpgrade python3-samba-debuginfoUpgrade libnetapiUpgrade samba-dcerpc-debuginfoUpgrade samba-usersharesUpgrade samba-client-debuginfoUpgrade samba-winbind-debuginfoUpgrade samba-libs-debuginfoUpgrade python3-samba-testUpgrade python3-samba-dcUpgrade python3-ldb-debuginfoUpgrade samba-client-libsUpgrade python3-ldbUpgrade python3-sambaUpgrade samba-winbind-clientsUpgrade samba-develUpgrade samba-winbind-clients-debuginfoUpgrade samba-winbind-krb5-locator-debuginfoUpgrade samba-winbindUpgrade samba-winbind-krb5-locatorUpgrade libwbclientUpgrade samba-libsUpgrade samba-clientUpgrade libsmbclient-develUpgrade samba-winexeUpgrade samba-winbind-modules-debuginfoUpgrade samba-krb5-printing-debuginfoUpgrade samba-common-toolsUpgrade libldb-develUpgrade samba-winexe-debuginfoUpgrade ctdbUpgrade libnetapi-develUpgrade ldb-tools-debuginfoUpgrade samba-client-libs-debuginfoUpgrade samba-test-libsUpgrade libsmbclientUpgrade samba-common-libs-debuginfoUpgrade samba-testUpgrade libldbUpgrade samba-toolsUpgrade samba-vfs-iouring-debuginfoUpgrade ctdb-debuginfoUpgrade samba-winbind-modulesUpgrade python3-samba-develUpgrade samba-dc-libsUpgrade libwbclient-debuginfoUpgrade samba-dc-libs-debuginfoUpgrade python3-samba-dc-debuginfoUpgrade samba-debugsourceUpgrade ldb-toolsUpgrade samba-common-libsUpgrade samba-common-tools-debuginfoUpgrade libnetapi-debuginfoUpgrade samba-vfs-iouringUpgrade samba-ldb-ldap-modules-debuginfoUpgrade samba-dcerpcUpgrade samba-test-libs-debuginfoUpgrade libldb-debuginfoUpgrade samba-debuginfoUpgrade libwbclient-develUpgrade libsmbclient-debuginfo	Jun 17, 2026	Jun 13, 2026
Suse	—	Upgrade samba-winbindUpgrade ctdb-pcp-pmdaUpgrade samba-cephUpgrade samba-dcerpcUpgrade sambaUpgrade libldb-develUpgrade samba-winbind-libsUpgrade libsamba-policy0-python3-32bitUpgrade samba-python3Upgrade libldb2Upgrade samba-libs-python3Upgrade samba-winbind-libs-32bitUpgrade samba-ldb-ldapUpgrade ctdbUpgrade libsamba-policy-develUpgrade samba-ad-dcUpgrade samba-docUpgrade samba-client-langUpgrade samba-ad-dc-libsUpgrade samba-client-libsUpgrade samba-libs-32bitUpgrade samba-develUpgrade samba-toolUpgrade samba-winbind-libs-langUpgrade samba-client-32bitUpgrade libsamba-policy0-python3Upgrade samba-libsUpgrade samba-gpupdateUpgrade libldb2-32bitUpgrade samba-clientUpgrade libsamba-policy-python3-develUpgrade samba-testUpgrade samba-devel-32bitUpgrade python3-ldbUpgrade ldb-toolsUpgrade samba-libs-python3-32bitUpgrade samba-dsdb-modulesUpgrade samba-client-libs-32bit	May 27, 2026	May 27, 2026
Ubuntu	—	Upgrade samba	May 27, 2026	May 26, 2026

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