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Fencer Vulns
medium 6.5

CVE-2026-21968 json

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).

published 2026-01-20 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-3544

cvss
6.5
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 23%
public exploits
0
none known

Summary

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Patch / fix

  • oracle mysql 8.0.45, 8.4.8, 9.6.0
  • oracle mysql_server 8.0.45, 8.4.8, 9.6.0
  • mariadb Debian 12 1:10.11.18-0+deb12u1
  • mariadb Debian 13 11.8.6-0+deb13u1
  • mariadb Debian 14 1:11.8.5-1

debian advisories DEBIAN-CVE-2026-21968

  • mysql-8.0 Ubuntu 22.04 LTS 8.0.45-0ubuntu0.22.04.1
  • mysql-8.0 Ubuntu 24.04 LTS 8.0.45-0ubuntu0.24.04.1
  • mysql-8.4 Ubuntu 25.10 8.4.8-0ubuntu0.25.10.1
  • mysql-8.4 Ubuntu 26.04 LTS 8.4.8-0ubuntu1
  • mysql-8.0 Ubuntu Pro 20.04 LTS 8.0.45-0ubuntu0.20.04.1+esm2

ubuntu advisories UBUNTU-CVE-2026-21968

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

  • Judy RHEL 8 1.0.5-18.module+el8.10.0+21221+7bee72c1
  • galera RHEL 8 26.4.23-1.module+el8.10.0+24010+d874728a
  • mariadb RHEL 8 3:10.11.15-1.module+el8.10.0+24010+d874728a
  • mariadb-pam RHEL 8 3:10.11.15-1.module+el8.10.0+24010+d874728a
  • mariadb-test RHEL 8 3:10.11.15-1.module+el8.10.0+24010+d874728a
  • mariadb-backup RHEL 8 3:10.11.15-1.module+el8.10.0+24010+d874728a
  • mariadb-common RHEL 8 3:10.11.15-1.module+el8.10.0+24010+d874728a
  • mariadb-errmsg RHEL 8 3:10.11.15-1.module+el8.10.0+24010+d874728a

red hat advisories RHSA-2026:6435RHSA-2026:6391RHSA-2026:5640RHSA-2026:5580RHSA-2026:4828RHSA-2026:4162

  • Judy AlmaLinux 8 1.0.5-18.module_el8.10.0+3794+c6a66d65
  • Judy AlmaLinux 8 1.0.5-18.module_el8.10.0+3955+6534edaf
  • galera AlmaLinux 8 26.4.23-1.module_el8.10.0+4152+4d93c53f
  • mariadb AlmaLinux 8 3:10.11.15-1.module_el8.10.0+4152+4d93c53f
  • mariadb-pam AlmaLinux 8 3:10.11.15-1.module_el8.10.0+4152+4d93c53f
  • mariadb-test AlmaLinux 8 3:10.11.15-1.module_el8.10.0+4152+4d93c53f
  • mariadb-backup AlmaLinux 8 3:10.11.15-1.module_el8.10.0+4152+4d93c53f
  • mariadb-common AlmaLinux 8 3:10.11.15-1.module_el8.10.0+4152+4d93c53f

almalinux advisories ALSA-2026:6435ALSA-2026:6391ALSA-2026:5580ALSA-2026:5640ALSA-2026:4828ALSA-2026:4162

  • mysql8.4 Rocky Linux 10 8.4.8-1.el10_1.rocky.0.1
  • Judy Rocky Linux 8 1.0.5-18.module+el8.4.0+431+26aaed18
  • Judy Rocky Linux 8 1.0.5-18.module+el8.10.0+1925+356c22e8
  • Judy Rocky Linux 8 1.0.5-18.module+el8.10.0+40062+b4bfe4b1
  • Judy Rocky Linux 8 1.0.5-18.module+el8.10.0+1674+fa55eae9
  • Judy Rocky Linux 8 1.0.5-18.module+el8.4.0+427+adf35707
  • mecab Rocky Linux 8 0.996-2.module+el8.10.0+1937+28fbbc83
  • mecab Rocky Linux 8 0.996-2.module+el8.10.0+1676+9b4b6e24

rocky linux advisories RLSA-2026:4162RLSA-2026:6435RLSA-2026:6391RLSA-2026:5640RLSA-2026:5580RLSA-2026:4828

  • mysql CBL-Mariner 2.0, Azure Linux 3.0 8.0.45-1

azure linux advisories AZL-74943AZL-75011

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-21968 updated cvss 6.5

mysql: Optimizer unspecified vulnerability (CPU Jan 2026)

  • Red Hat Enterprise Linux 9 mariadb, mariadb-pam, mariadb-test, mariadb-backup, mariadb-common, mariadb-errmsg, +6 more Red Hat Enterprise Linux 10 mariadb10.11
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) Judy 1.0.5-18.module+el8.10.0+21221+7bee72c1, mecab 0.996-2.module+el8.10.0+22857+7f331edd, mecab 0.996-2.module+el8.10.0+23550+bd321b9a, mysql 8.4.8-1.module+el8.10.0+24007+c07a67f2, mysql 8.0.45-1.module+el8.10.0+24016+b28eaa79, galera 26.4.23-1.module+el8.10.0+24010+d874728a, +27 more
    fixed: vendor fix RHSA-2026:6435
  • Red Hat Enterprise Linux AppStream (v. 9) mysql 8.0.45-1.el9_7, mysql-libs 8.0.45-1.el9_7, mysql-common 8.0.45-1.el9_7, mysql-errmsg 8.0.45-1.el9_7, mysql-server 8.0.45-1.el9_7, mysql 8.4.8-1.module+el9.7.0+24088+36dcab8d, +10 more
    fixed: vendor fix RHSA-2026:5640
  • Red Hat Enterprise Linux AppStream (v. 10) mysql8.4 8.4.8-1.el10_1, mysql8.4-libs 8.4.8-1.el10_1, mysql8.4-common 8.4.8-1.el10_1, mysql8.4-errmsg 8.4.8-1.el10_1, mysql8.4-server 8.4.8-1.el10_1
    fixed: vendor fix RHSA-2026:4162
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) mariadb 10.11.15-1.el10_0, mariadb-pam 10.11.15-1.el10_0, mariadb-test 10.11.15-1.el10_0, mariadb10.11 10.11.15-1.el10_0, mariadb-backup 10.11.15-1.el10_0, mariadb-common 10.11.15-1.el10_0, +8 more
    fixed: vendor fix RHSA-2026:0376
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) galera 26.4.16-1.module+el9.4.0+21205+b026b850, mariadb 10.11.15-1.module+el9.4.0+23801+22792e5c, mariadb-pam 10.11.15-1.module+el9.4.0+23801+22792e5c, mariadb-test 10.11.15-1.module+el9.4.0+23801+22792e5c, mariadb-backup 10.11.15-1.module+el9.4.0+23801+22792e5c, mariadb-common 10.11.15-1.module+el9.4.0+23801+22792e5c, +7 more
    fixed: vendor fix RHSA-2026:0335
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) galera 26.4.20-1.module+el9.5.0+22578+dc54e53f, mariadb 10.11.15-1.module+el9.6.0+23803+16eaad56, mariadb-pam 10.11.15-1.module+el9.6.0+23803+16eaad56, mariadb-test 10.11.15-1.module+el9.6.0+23803+16eaad56, mariadb-backup 10.11.15-1.module+el9.6.0+23803+16eaad56, mariadb-common 10.11.15-1.module+el9.6.0+23803+16eaad56, +7 more
    fixed: vendor fix RHSA-2026:0334
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) mysql-test 8.0.45-1.el9_7
    fixed: vendor fix RHSA-2026:4828
show 2 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) mysql8.4-test 8.4.8-1.el10_1, mysql8.4-test-data 8.4.8-1.el10_1
    fixed: vendor fix RHSA-2026:4162
  • Red Hat Enterprise Linux 6 mysql, mysql-libs, mysql-test, mysql-bench, mysql-server, mysql-embedded
    not affected: vulnerable code not present

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
partial
Assessed
9 mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Oracle Corporation MySQL Server

Classification

Technology feeds

References

Sources

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.