CVE-2026-3012
High
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.
SeverityHigh
CVSS8.0
Exploit probability—
Product
Samba
PublishedMay 27, 2026
First seenMay 27, 2026
Weakness typeCWE-345CWE-345
How to fix
Update
- samba samba4.21.0 or later
Vendor advisories
- access.redhat.com/security/cve/CVE-2026-3012
- bugzilla.samba.org/show_bug.cgi?id=16003
- access.redhat.com/errata/RHSA-2026:22644
- access.redhat.com/errata/RHSA-2026:22963
- access.redhat.com/errata/RHSA-2026:25049
- access.redhat.com/errata/RHSA-2026:25979
- access.redhat.com/errata/RHSA-2026:28053
- access.redhat.com/errata/RHSA-2026:28054
- access.redhat.com/errata/RHSA-2026:28055
- access.redhat.com/errata/RHSA-2026:28056
- access.redhat.com/errata/RHSA-2026:28057
- access.redhat.com/errata/RHSA-2026:29863
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| samba samba | 4.16.0 ≤ v < 4.21.0 | 4.21.0 |
| redhat openshift_container_platform | 4.0 | — |
| redhat enterprise_linux | 7.0, 9.0 | — |
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