8

CVE-2026-3012: Samba: group policy certificate enrollment uses http:// without validation

Modified
AliasesALPINE-CVE-2026-3012UBUNTU-CVE-2026-3012DEBIAN-CVE-2026-3012
Published 27-05-2026Last modified 15-10-2026

Vulnerability summary

CVE-2026-3012 is a high (CVSS 8.0) vulnerability in redhat enterprise_linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.0/10
010
High · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 9
OPENSUSE-SU-2026:10884-1OPENSUSE-SU-2026:20905-1OPENSUSE-SU-2026:21540-1RHSA-2026:22644RHSA-2026:22963RHSA-2026:25049

Timeline

  1. 27-05-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability 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

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat2 products
Alpine1 product
  • samba≥ 4.16.0, < 4.22.10-r0 | ≥ 4.16.0, < 4.23.8-r0
Debian1 product
  • samba< 2:4.17.12+dfsg-0+deb12u4 | < 2:4.22.8+dfsg-0+deb13u2 | < 2:4.24.3+dfsg-1
Samba1 product
  • samba≥ 4.16.0, < 4.21.0
Ubuntu1 product
  • samba< 2:4.19.5+dfsg-4ubuntu9.6 | < 2:4.22.3+dfsg-4ubuntu2.4 | < 2:4.23.6+dfsg-1ubuntu2.1

5 vendors · 6 products

References

33 links
Show all 33 references