CVE-2026-3012

Aliases:DEBIAN-CVE-2026-3012ALPINE-CVE-2026-3012
Advisory lineage Upstream: 0 Downstream: 21
Modified
Published: 27 May 2026, 10:02
Last modified:18 Sept 2026, 12:04

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
8 HIGH
v3.1 (cve.org)
EPSS Score
0.26% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

27 May 2026, 10:02
Published
Vulnerability first disclosed
18 Sept 2026, 12:04
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 8CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
  • v3.1•MEDIUM•Score: 6.8CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.26%• Percentile: 18%

Techniques & Countermeasures

  • CWE-345•Insufficient Verification of Data Authenticity

    The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

Affected Systems

  • alpine•samba

    ≥ 4.16.0, < 4.22.10-r0 | ≥ 4.16.0, < 4.23.8-r0

  • debian•samba

    < 2:4.13.13+dfsg-1~deb11u8 | < 2:4.17.12+dfsg-0+deb12u4 | < 2:4.22.8+dfsg-0+deb13u2 | < 2:4.24.3+dfsg-1

  • redhat•enterprise_linux

    7.0 | 9.0

  • redhat•openshift_container_platform

    4.0

  • samba•samba

    ≥ 4.16.0, < 4.21.0

References (27)