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HIGH

CVE-2026-3012

CVSS v3

8

HIGH

EPSS Score

0.2 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • sambaAlmaLinux:10all versions · fixed in 4.23.5-109.el10_2and 36 other packages
  • sambaAlmaLinux:9all versions · fixed in 4.23.5-10.el9_8and 36 other packages
  • sambaAlmaLinux:8all versions · fixed in 4.19.4-16.el8_10and 33 other packages

Vendor advisories

  • CVE-2026-3012 Red Hat Product Security3,947 products fixed · 59 known affected

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

    libsmbclient as a component of Red Hat Enterprise Linux 6 · libsmbclient-devel as a component of Red Hat Enterprise Linux 6 · samba as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:77320 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.13.72 bug fix and security update

  • RHSA-2026:70586 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.17.58 bug fix and security update

  • RHSA-2026:67857 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.15.69 bug fix and security update

  • RHSA-2026:65839 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.13.71 bug fix and security update

  • RHSA-2026:65851 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.18.55 bug fix and security update

19 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Published
2026-05-27
Last Modified
2026-07-15

Frequently asked questions

What is CVE-2026-3012?

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.

Is CVE-2026-3012 actively exploited?

Active exploitation of CVE-2026-3012 has not been confirmed. Its EPSS score was 0.2% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-3012?

CVE-2026-3012 has a CVSS v3 base score of 8 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

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