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CVE-2026-3012

35
FAUCET Score

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.

First published: May 27, 2026Last modified: Jul 2, 2026

Impacted Technologies

VendorProductVersion(s)CPE
4.0CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
>= 4.16.0, < 4.21.0CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.0HIGH

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
17.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 24th percentile among its peer group of 239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

ubuntupatch availablevia ubuntu_usn
Product: samba (jammy)Fixed in: 2:4.15.13+dfsg-0ubuntu1.12
ubuntupatch availablevia ubuntu_usn
Product: samba (noble)Fixed in: 2:4.19.5+dfsg-4ubuntu9.6
ubuntupatch availablevia ubuntu_usn
Product: samba (questing)Fixed in: 2:4.22.3+dfsg-4ubuntu2.4
ubuntupatch availablevia ubuntu_usn
Product: samba (resolute)Fixed in: 2:4.23.6+dfsg-1ubuntu2.1
redhatworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

ubuntuUSN-8306-1

Samba vulnerabilities

May 26, 2026

References

security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-3012.json
access.redhat.com / errata/RHSA-2026:22644
Issue Tracking
access.redhat.com / errata/RHSA-2026:22963
Issue Tracking
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
access.redhat.com / security/cve/CVE-2026-3012
MitigationThird Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
bugzilla.samba.org / show_bug.cgi
Issue TrackingMitigationVendor Advisory