CVE-2026-3012 json
Samba: group policy certificate enrollment uses http:// without validation
published 2026-05-27 5 mo ago modified 2026-11-04 4 d ago also EUVD-2026-32211
- cvss
- 8.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Red Hat Red Hat Enterprise Linux 10 0:4.23.5-109.el10_2
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:4.21.3-114.el10_0.1
- Red Hat Red Hat Enterprise Linux 8 0:4.19.4-16.el8_10
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:4.15.5-16.el8_6.1
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:4.15.5-16.el8_6.1
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.17.5-7.el8_8.1
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:4.17.5-7.el8_8.1
- Red Hat Red Hat Enterprise Linux 9 0:4.23.5-10.el9_8
- Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:4.17.5-105.el9_2.5
- Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:4.19.4-105.el9_4.4
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:4.21.3-14.el9_6.1
- Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202608241157-0, 412.86.202609082051-0
- Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202609080414-0, 413.92.202609302032-0
- Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202608172040-0, 414.92.202609011250-0
- Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202608180329-0, 415.92.202609140326-0
- Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202608150307-0, 416.94.202609011112-0
- Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202608250221-0, 417.94.202609191027-0
- Red Hat Red Hat OpenShift Container Platform 4.18 418.94.202608142238-0, 418.94.202609031320-0
- Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202606241344-0
- samba Debian 12 2:4.17.12+dfsg-0+deb12u4
- samba Debian 13 2:4.22.8+dfsg-0+deb13u2
- samba Debian 14 2:4.24.3+dfsg-1
debian advisories DEBIAN-CVE-2026-3012
- samba Ubuntu 24.04 LTS 2:4.19.5+dfsg-4ubuntu9.6
- samba Ubuntu 25.10 2:4.22.3+dfsg-4ubuntu2.4
- samba Ubuntu 26.04 LTS 2:4.23.6+dfsg-1ubuntu2.1
ubuntu advisories UBUNTU-CVE-2026-3012
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- samba RHEL 9 4.23.5-10.el9_8
- ctdb RHEL 9 4.23.5-10.el9_8
- libldb RHEL 9 4.23.5-10.el9_8
- ldb-tools RHEL 9 4.23.5-10.el9_8
- libnetapi RHEL 9 4.23.5-10.el9_8
- samba-libs RHEL 9 4.23.5-10.el9_8
- samba-pidl RHEL 9 4.23.5-10.el9_8
- samba-test RHEL 9 4.23.5-10.el9_8
red hat advisories RHSA-2026:28057RHSA-2026:28056RHSA-2026:28054RHSA-2026:28055RHSA-2026:28053RHSA-2026:25979
- samba SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.22.11+git.552.66cfeb7de0a-160000.1.1
- samba SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.22.9+git.506.22c03ce0781-160000.1.1
suse advisories SUSE-SU-2026:23003-1SUSE-SU-2026:23129-1SUSE-SU-2026:23152-1SUSE-SU-2026:22045-1SUSE-SU-2026:22080-1
- samba openSUSE Leap 16.0 4.22.11+git.552.66cfeb7de0a-160000.1.1
- samba openSUSE Leap 16.0 4.22.9+git.506.22c03ce0781-160000.1.1
- samba openSUSE Tumbleweed 4.23.8+git.477.f78166bceed-1.1
opensuse advisories openSUSE-SU-2026:21540-1openSUSE-SU-2026:20905-1openSUSE-SU-2026:10884-1
- samba AlmaLinux 9 4.23.5-10.el9_8
- libldb AlmaLinux 9 4.23.5-10.el9_8
- ldb-tools AlmaLinux 9 4.23.5-10.el9_8
- libnetapi AlmaLinux 9 4.23.5-10.el9_8
- samba-libs AlmaLinux 9 4.23.5-10.el9_8
- samba-pidl AlmaLinux 9 4.23.5-10.el9_8
- samba-test AlmaLinux 9 4.23.5-10.el9_8
- libwbclient AlmaLinux 9 4.23.5-10.el9_8
almalinux advisories ALSA-2026:25049ALSA-2026:22963ALSA-2026:22644
- samba Rocky Linux 9 4.23.5-10.el9_8
- samba Rocky Linux 10 4.23.5-109.el10_2
- samba Rocky Linux 8 4.19.4-16.el8_10
rocky linux advisories RLSA-2026:25049RLSA-2026:22963RLSA-2026:22644
- samba Alpine 3.23 4.22.10-r0
- samba Alpine 3.24 4.23.8-r0
alpine advisories ALPINE-CVE-2026-3012
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-3012 updated cvss 8.0
samba: group policy certificate enrollment uses http:// without validation
-
Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 moreaffected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 moreaffected: workaround, no fix planned “Will not fix”
-
Red Hat CodeReady Linux Builder EUS (v.9.6) samba-pidl 4.21.3-14.el9_6.1, samba-test 4.21.3-14.el9_6.1, samba-test-libs 4.21.3-14.el9_6.1, python3-samba-test 4.21.3-14.el9_6.1fixed: vendor fix RHSA-2026:25979
-
Red Hat Enterprise Linux AppStream (v. 8) samba-vfs-iouring 4.19.4-16.el8_10fixed: vendor fix RHSA-2026:22644
-
Red Hat Enterprise Linux AppStream (v. 9) samba-client 4.23.5-10.el9_8, samba-winexe 4.23.5-10.el9_8, samba-gpupdate 4.23.5-10.el9_8, samba-vfs-iouring 4.23.5-10.el9_8, samba-krb5-printing 4.23.5-10.el9_8, samba-winbind-clients 4.23.5-10.el9_8, +1 morefixed: vendor fix RHSA-2026:25049
-
Red Hat Enterprise Linux AppStream (v. 10) samba-client 4.23.5-109.el10_2, samba-winexe 4.23.5-109.el10_2, samba-gpupdate 4.23.5-109.el10_2, samba-vfs-iouring 4.23.5-109.el10_2, samba-krb5-printing 4.23.5-109.el10_2, samba-winbind-clients 4.23.5-109.el10_2, +1 morefixed: vendor fix RHSA-2026:22963
-
Red Hat Enterprise Linux AppStream AUS (v.8.6) samba-vfs-iouring 4.15.5-16.el8_6.1fixed: vendor fix RHSA-2026:28057
-
Red Hat Enterprise Linux AppStream E4S (v.8.8) samba-vfs-iouring 4.17.5-7.el8_8.1fixed: vendor fix RHSA-2026:28056
show 32 moreshow fewer
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Red Hat Enterprise Linux AppStream E4S (v.9.2) samba-client 4.17.5-105.el9_2.5, samba-winexe 4.17.5-105.el9_2.5, samba-vfs-iouring 4.17.5-105.el9_2.5, samba-krb5-printing 4.17.5-105.el9_2.5, samba-winbind-clients 4.17.5-105.el9_2.5, samba-winbind-krb5-locator 4.17.5-105.el9_2.5fixed: vendor fix RHSA-2026:28054
-
Red Hat Enterprise Linux AppStream E4S (v.9.4) samba-client 4.19.4-105.el9_4.4, samba-winexe 4.19.4-105.el9_4.4, samba-vfs-iouring 4.19.4-105.el9_4.4, samba-krb5-printing 4.19.4-105.el9_4.4, samba-winbind-clients 4.19.4-105.el9_4.4, samba-winbind-krb5-locator 4.19.4-105.el9_4.4fixed: vendor fix RHSA-2026:28053
-
Red Hat Enterprise Linux AppStream EUS (v. 10.0) samba-client 4.21.3-114.el10_0.1, samba-winexe 4.21.3-114.el10_0.1, samba-gpupdate 4.21.3-114.el10_0.1, samba-vfs-iouring 4.21.3-114.el10_0.1, samba-krb5-printing 4.21.3-114.el10_0.1, samba-winbind-clients 4.21.3-114.el10_0.1, +1 morefixed: vendor fix RHSA-2026:28055
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) samba-client 4.21.3-14.el9_6.1, samba-winexe 4.21.3-14.el9_6.1, samba-gpupdate 4.21.3-14.el9_6.1, samba-vfs-iouring 4.21.3-14.el9_6.1, samba-krb5-printing 4.21.3-14.el9_6.1, samba-winbind-clients 4.21.3-14.el9_6.1, +1 morefixed: vendor fix RHSA-2026:25979
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) samba-vfs-iouring 4.15.5-16.el8_6.1fixed: vendor fix RHSA-2026:28057
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Red Hat Enterprise Linux AppStream TUS (v.8.8) samba-vfs-iouring 4.17.5-7.el8_8.1fixed: vendor fix RHSA-2026:28056
-
Red Hat Enterprise Linux BaseOS (v. 8) ctdb 4.19.4-16.el8_10, samba 4.19.4-16.el8_10, libnetapi 4.19.4-16.el8_10, samba-libs 4.19.4-16.el8_10, samba-pidl 4.19.4-16.el8_10, samba-test 4.19.4-16.el8_10, +22 morefixed: vendor fix RHSA-2026:22644
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Red Hat Enterprise Linux BaseOS (v. 9) samba 4.23.5-10.el9_8, libldb 4.23.5-10.el9_8, ldb-tools 4.23.5-10.el9_8, libnetapi 4.23.5-10.el9_8, samba-libs 4.23.5-10.el9_8, libwbclient 4.23.5-10.el9_8, +15 morefixed: vendor fix RHSA-2026:25049
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Red Hat Enterprise Linux BaseOS (v. 10) samba 4.23.5-109.el10_2, libldb 4.23.5-109.el10_2, ldb-tools 4.23.5-109.el10_2, libnetapi 4.23.5-109.el10_2, samba-libs 4.23.5-109.el10_2, libwbclient 4.23.5-109.el10_2, +15 morefixed: vendor fix RHSA-2026:22963
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Red Hat Enterprise Linux BaseOS AUS (v.8.6) ctdb 4.15.5-16.el8_6.1, samba 4.15.5-16.el8_6.1, samba-libs 4.15.5-16.el8_6.1, samba-pidl 4.15.5-16.el8_6.1, samba-test 4.15.5-16.el8_6.1, libwbclient 4.15.5-16.el8_6.1, +15 morefixed: vendor fix RHSA-2026:28057
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Red Hat Enterprise Linux BaseOS E4S (v.8.8) ctdb 4.17.5-7.el8_8.1, samba 4.17.5-7.el8_8.1, libnetapi 4.17.5-7.el8_8.1, samba-libs 4.17.5-7.el8_8.1, samba-pidl 4.17.5-7.el8_8.1, samba-test 4.17.5-7.el8_8.1, +22 morefixed: vendor fix RHSA-2026:28056
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Red Hat Enterprise Linux BaseOS E4S (v.9.2) samba 4.17.5-105.el9_2.5, libnetapi 4.17.5-105.el9_2.5, samba-libs 4.17.5-105.el9_2.5, libwbclient 4.17.5-105.el9_2.5, samba-tools 4.17.5-105.el9_2.5, libsmbclient 4.17.5-105.el9_2.5, +12 morefixed: vendor fix RHSA-2026:28054
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Red Hat Enterprise Linux BaseOS E4S (v.9.4) samba 4.19.4-105.el9_4.4, libnetapi 4.19.4-105.el9_4.4, samba-libs 4.19.4-105.el9_4.4, libwbclient 4.19.4-105.el9_4.4, samba-tools 4.19.4-105.el9_4.4, libsmbclient 4.19.4-105.el9_4.4, +12 morefixed: vendor fix RHSA-2026:28053
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Red Hat Enterprise Linux BaseOS EUS (v. 10.0) samba 4.21.3-114.el10_0.1, libldb 4.21.3-114.el10_0.1, ldb-tools 4.21.3-114.el10_0.1, libnetapi 4.21.3-114.el10_0.1, samba-libs 4.21.3-114.el10_0.1, libwbclient 4.21.3-114.el10_0.1, +15 morefixed: vendor fix RHSA-2026:28055
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Red Hat Enterprise Linux BaseOS EUS (v.9.6) samba 4.21.3-14.el9_6.1, libldb 4.21.3-14.el9_6.1, ldb-tools 4.21.3-14.el9_6.1, libnetapi 4.21.3-14.el9_6.1, samba-libs 4.21.3-14.el9_6.1, libwbclient 4.21.3-14.el9_6.1, +15 morefixed: vendor fix RHSA-2026:25979
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Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) ctdb 4.15.5-16.el8_6.1, samba 4.15.5-16.el8_6.1, samba-libs 4.15.5-16.el8_6.1, samba-pidl 4.15.5-16.el8_6.1, samba-test 4.15.5-16.el8_6.1, libwbclient 4.15.5-16.el8_6.1, +15 morefixed: vendor fix RHSA-2026:28057
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Red Hat Enterprise Linux BaseOS TUS (v.8.8) ctdb 4.17.5-7.el8_8.1, samba 4.17.5-7.el8_8.1, libnetapi 4.17.5-7.el8_8.1, samba-libs 4.17.5-7.el8_8.1, samba-pidl 4.17.5-7.el8_8.1, samba-test 4.17.5-7.el8_8.1, +22 morefixed: vendor fix RHSA-2026:28056
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) samba-pidl 4.23.5-10.el9_8, samba-test 4.23.5-10.el9_8, samba-test-libs 4.23.5-10.el9_8, python3-samba-test 4.23.5-10.el9_8fixed: vendor fix RHSA-2026:25049
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) samba-pidl 4.23.5-109.el10_2, samba-test 4.23.5-109.el10_2, samba-test-libs 4.23.5-109.el10_2, python3-samba-test 4.23.5-109.el10_2fixed: vendor fix RHSA-2026:22963
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Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) samba-pidl 4.21.3-114.el10_0.1, samba-test 4.21.3-114.el10_0.1, samba-test-libs 4.21.3-114.el10_0.1, python3-samba-test 4.21.3-114.el10_0.1fixed: vendor fix RHSA-2026:28055
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Red Hat Enterprise Linux CRB (v. 8) samba-devel 4.19.4-16.el8_10, ctdb-debuginfo 4.19.4-16.el8_10, libnetapi-devel 4.19.4-16.el8_10, samba-debuginfo 4.19.4-16.el8_10, libwbclient-devel 4.19.4-16.el8_10, samba-debugsource 4.19.4-16.el8_10, +24 morefixed: vendor fix RHSA-2026:22644
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Red Hat Enterprise Linux Resilient Storage (v. 9) ctdb 4.23.5-10.el9_8fixed: vendor fix RHSA-2026:25049
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Red Hat Enterprise Linux Resilient Storage E4S (v.9.2) ctdb 4.17.5-105.el9_2.5fixed: vendor fix RHSA-2026:28054
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Red Hat Enterprise Linux Resilient Storage E4S (v.9.4) ctdb 4.19.4-105.el9_4.4fixed: vendor fix RHSA-2026:28053
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Red Hat Enterprise Linux Resilient Storage EUS (v.9.6) ctdb 4.21.3-14.el9_6.1fixed: vendor fix RHSA-2026:25979
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Red Hat OpenShift Container Platform 4.12 rhcos 412.86.202608241157, rhcos 412.86.202609082051fixed: vendor fix RHSA-2026:59831
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Red Hat OpenShift Container Platform 4.13 rhcos 413.92.202609080414, rhcos 413.92.202609302032fixed: vendor fix RHSA-2026:65839
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Red Hat OpenShift Container Platform 4.14 rhcos 414.92.202608172040, rhcos 414.92.202609011250fixed: vendor fix RHSA-2026:56786
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Red Hat OpenShift Container Platform 4.15 rhcos 415.92.202608180329, rhcos 415.92.202609140326fixed: vendor fix RHSA-2026:56911
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Red Hat OpenShift Container Platform 4.16 rhcos 416.94.202608150307, rhcos 416.94.202609011112fixed: vendor fix RHSA-2026:56853
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Red Hat OpenShift Container Platform 4.17 rhcos 417.94.202608250221, rhcos 417.94.202609191027fixed: vendor fix RHSA-2026:60019
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Red Hat OpenShift Container Platform 4.18 rhcos 418.94.202608142238, rhcos 418.94.202609031320fixed: vendor fix RHSA-2026:57483
1 more fixed in the full advisory
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.0 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N |
| CISA ADP | 3.1 | 8.0 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 6.8 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
- Red Hat Red Hat OpenShift Container Platform 4.12
- Red Hat Red Hat OpenShift Container Platform 4.13
- Red Hat Red Hat OpenShift Container Platform 4.14
- Red Hat Red Hat OpenShift Container Platform 4.15
- Red Hat Red Hat OpenShift Container Platform 4.16
- Red Hat Red Hat OpenShift Container Platform 4.17
- Red Hat Red Hat OpenShift Container Platform 4.18
- Red Hat Red Hat OpenShift Container Platform 4.19
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7
- Red Hat Red Hat OpenShift Container Platform 4
Classification
- Weakness
-
- CWE-345 Insufficient Verification of Data Authenticity
References
-
access.redhat.com
/errata/RHSA-2026:22644
vendor-advisory, issue-tracking
-
access.redhat.com
/errata/RHSA-2026:22963
vendor-advisory, issue-tracking
-
access.redhat.com
/errata/RHSA-2026:25049
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:25979
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:28053
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:28054
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:28055
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:28056
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:28057
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:29863
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:56786
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:56853
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:56911
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:57483
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:59831
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:60019
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:62409
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:62549
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:65839
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:65851
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:65907
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:67857
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:70586
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:77320
vendor-advisory
-
bugzilla.samba.org
/show_bug.cgi?id=16003
issue-tracking, mitigation, vendor-advisory
-
access.redhat.com
/security/cve/CVE-2026-3012
vdb-entry, mitigation, third-party-advisory
-
bugzilla.redhat.com
/show_bug.cgi?id=2447319
issue-tracking, third-party-advisory
- security.access.redhat.com /data/csaf/v2/vex/2026/cve-2026-3012.json
Sources
- CVE List CVE-2026-3012
- NVD CVE-2026-3012
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.