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Fencer Vulns
medium 4.9

CVE-2026-21936 json

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

published 2026-01-20 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-3573

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). 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 high 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Patch / fix

  • oracle mysql_cluster 7.6.37, 8.0.45, 8.4.8, 9.6.0
  • oracle mysql 8.0.45, 8.4.8, 9.6.0
  • oracle mysql_server 8.0.45, 8.4.8, 9.6.0
  • 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-2026-21936

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

  • mecab RHEL 8 0.996-2.module+el8.10.0+23550+bd321b9a
  • mysql RHEL 8 8.4.8-1.module+el8.10.0+24007+c07a67f2
  • mysql-libs RHEL 8 8.4.8-1.module+el8.10.0+24007+c07a67f2
  • mysql-test RHEL 8 8.4.8-1.module+el8.10.0+24007+c07a67f2
  • mecab-ipadic RHEL 8 2.7.0.20070801-17.module+el8.10.0+23550+bd321b9a
  • mysql-common RHEL 8 8.4.8-1.module+el8.10.0+24007+c07a67f2
  • mysql-errmsg RHEL 8 8.4.8-1.module+el8.10.0+24007+c07a67f2
  • mysql-server RHEL 8 8.4.8-1.module+el8.10.0+24007+c07a67f2

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

  • mecab AlmaLinux 8 0.996-2.module_el8.10.0+4060+d4256e26
  • mysql AlmaLinux 8 8.4.8-1.module_el8.10.0+4154+a69a9128
  • mysql-libs AlmaLinux 8 8.4.8-1.module_el8.10.0+4154+a69a9128
  • mysql-test AlmaLinux 8 8.4.8-1.module_el8.10.0+4154+a69a9128
  • mecab-ipadic AlmaLinux 8 2.7.0.20070801-17.module_el8.10.0+4060+d4256e26
  • mecab-ipadic AlmaLinux 8 2.7.0.20070801-17.module_el8.10.0+4154+a69a9128
  • mysql-common AlmaLinux 8 8.4.8-1.module_el8.10.0+4154+a69a9128
  • mysql-errmsg AlmaLinux 8 8.4.8-1.module_el8.10.0+4154+a69a9128

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

  • mysql8.4 Rocky Linux 10 8.4.8-1.el10_1.rocky.0.1
  • 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
  • mecab Rocky Linux 8 0.996-2.module+el8.10.0+2091+db4d14f6
  • mecab-ipadic Rocky Linux 8 2.7.0.20070801-17.module+el8.10.0+1937+28fbbc83
  • mecab-ipadic Rocky Linux 8 2.7.0.20070801-17.module+el8.10.0+2091+db4d14f6
  • mecab Rocky Linux 9 0.996-3.module+el9.7.0+40027+0df0d4e0.4
  • rapidjson Rocky Linux 9 1.1.0-19.module+el9.7.0+40027+0df0d4e0

rocky linux advisories RLSA-2026:4162RLSA-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-74952AZL-74996

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-2026-21936 updated cvss 4.9

mysql: InnoDB unspecified vulnerability (CPU Jan 2026)

  • Red Hat Enterprise Linux AppStream (v. 8) 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, mysql-libs 8.4.8-1.module+el8.10.0+24007+c07a67f2, mysql-test 8.4.8-1.module+el8.10.0+24007+c07a67f2, +13 more
    fixed: vendor fix RHSA-2026:5580
  • 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 CodeReady Linux Builder (v. 9) mysql-test 8.0.45-1.el9_7
    fixed: vendor fix RHSA-2026:4828
  • 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

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Oracle Corporation MySQL Cluster
  • 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.