Vulnerability · Published Jan 20, 2026 · Assigned by oracle
CVE-2026-21941
Medium 4.9
In plain English
A medium-severity uncontrolled resource consumption in MySQL Server from Oracle Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.9Medium
Exploit odds (30 days)0.4%top 65.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 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).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | mecab | 0.996-2.module_el8.10.0+4060+d4256e26 | ALSA-2026:6391 |
| AlmaLinux:8 | mecab | 0.996-2.module_el8.10.0+3965+b415b607 | ALSA-2026:5580 |
| AlmaLinux:8 | mecab | 0.996-2.module_el8.6.0+3340+d764b636 | ALSA-2026:5580 |
| AlmaLinux:9 | mecab | 0.996-3.module_el9.6.0+152+8cbce00c.4 | ALSA-2026:5640 |
| AlmaLinux:8 | mecab-devel | 0.996-2.module_el8.10.0+3965+b415b607 | ALSA-2026:5580 |
| AlmaLinux:8 | mecab-devel | 0.996-2.module_el8.10.0+4060+d4256e26 | ALSA-2026:6391 |
| AlmaLinux:8 | mecab-devel | 0.996-2.module_el8.6.0+3340+d764b636 | ALSA-2026:5580 |
| AlmaLinux:9 | mecab-devel | 0.996-3.module_el9.6.0+152+8cbce00c.4 | ALSA-2026:5640 |
| AlmaLinux:8 | mecab-ipadic | 2.7.0.20070801-17.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:8 | mecab-ipadic | 2.7.0.20070801-17.module_el8.10.0+3965+b415b607 | ALSA-2026:5580 |
| AlmaLinux:8 | mecab-ipadic | 2.7.0.20070801-17.module_el8.10.0+4060+d4256e26 | ALSA-2026:6391 |
| AlmaLinux:8 | mecab-ipadic | 2.7.0.20070801-17.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:9 | mecab-ipadic | 2.7.0.20070801-24.module_el9.6.0+152+8cbce00c | ALSA-2026:5640 |
| AlmaLinux:8 | mecab-ipadic-EUCJP | 2.7.0.20070801-17.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:8 | mecab-ipadic-EUCJP | 2.7.0.20070801-17.module_el8.10.0+3965+b415b607 | ALSA-2026:5580 |
| AlmaLinux:8 | mecab-ipadic-EUCJP | 2.7.0.20070801-17.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:8 | mecab-ipadic-EUCJP | 2.7.0.20070801-17.module_el8.10.0+4060+d4256e26 | ALSA-2026:6391 |
| AlmaLinux:9 | mecab-ipadic-EUCJP | 2.7.0.20070801-24.module_el9.6.0+152+8cbce00c | ALSA-2026:5640 |
| AlmaLinux:8 | mysql | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:8 | mysql | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:9 | mysql | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:9 | mysql | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:8 | mysql-common | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:8 | mysql-common | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:9 | mysql-common | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:9 | mysql-common | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:8 | mysql-devel | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:8 | mysql-devel | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:9 | mysql-devel | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:9 | mysql-devel | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:8 | mysql-errmsg | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:8 | mysql-errmsg | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:9 | mysql-errmsg | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:9 | mysql-errmsg | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:8 | mysql-libs | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:8 | mysql-libs | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:9 | mysql-libs | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:9 | mysql-libs | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:8 | mysql-server | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:8 | mysql-server | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:9 | mysql-server | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:9 | mysql-server | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:8 | mysql-test | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:8 | mysql-test | 8.0.45-1.module_el8.10.0+4142+0b28b031 | ALSA-2026:5580 |
| AlmaLinux:9 | mysql-test | 8.0.45-1.el9_7 | ALSA-2026:4828 |
| AlmaLinux:9 | mysql-test | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:8 | mysql-test-data | 8.4.8-1.module_el8.10.0+4154+a69a9128 | ALSA-2026:6391 |
| AlmaLinux:9 | mysql-test-data | 8.4.8-1.module_el9.7.0+219+aca48cd3 | ALSA-2026:5640 |
| AlmaLinux:10 | mysql8.4-common | 8.4.8-1.el10_1 | ALSA-2026:4162 |
| AlmaLinux:10 | mysql8.4-errmsg | 8.4.8-1.el10_1 | ALSA-2026:4162 |
| AlmaLinux:10 | mysql8.4-test-data | 8.4.8-1.el10_1 | ALSA-2026:4162 |
| AlmaLinux:9 | rapidjson-devel | 1.1.0-19.module_el9.6.0+152+8cbce00c | ALSA-2026:5640 |
| AlmaLinux:9 | rapidjson-doc | 1.1.0-19.module_el9.6.0+152+8cbce00c | ALSA-2026:5640 |
| Rocky Linux:8 | mecab | 0:0.996-2.module+el8.10.0+2091+db4d14f6 | RLSA-2026:6391 |
| Rocky Linux:8 | mecab | 0:0.996-2.module+el8.10.0+1676+9b4b6e24 | RLSA-2026:6391 |
| Rocky Linux:8 | mecab | 0:0.996-2.module+el8.10.0+1937+28fbbc83 | RLSA-2026:5580 |
| Rocky Linux:8 | mecab | 0:0.996-2.module+el8.10.0+2091+db4d14f6 | RLSA-2026:5580 |
| Rocky Linux:8 | mecab | 0:0.996-2.module+el8.10.0+1676+9b4b6e24 | RLSA-2026:5580 |
| Rocky Linux:8 | mecab | 0:0.996-2.module+el8.10.0+1937+28fbbc83 | RLSA-2026:6391 |
| Rocky Linux:9 | mecab | 0:0.996-3.module+el9.7.0+40027+0df0d4e0.4 | RLSA-2026:5640 |
| Rocky Linux:8 | mecab-ipadic | 0:2.7.0.20070801-17.module+el8.10.0+2091+db4d14f6 | RLSA-2026:5580 |
| Rocky Linux:8 | mecab-ipadic | 0:2.7.0.20070801-17.module+el8.10.0+1937+28fbbc83 | RLSA-2026:5580 |
| Rocky Linux:8 | mecab-ipadic | 0:2.7.0.20070801-17.module+el8.10.0+1937+28fbbc83 | RLSA-2026:6391 |
| Rocky Linux:8 | mecab-ipadic | 0:2.7.0.20070801-17.module+el8.10.0+2091+db4d14f6 | RLSA-2026:6391 |
| Rocky Linux:9 | mecab-ipadic | 0:2.7.0.20070801-24.module+el9.7.0+40027+0df0d4e0 | RLSA-2026:5640 |
| Rocky Linux:9 | mysql | 0:8.0.45-1.el9_7 | RLSA-2026:4828 |
| Rocky Linux:10 | mysql8.4 | 0:8.4.8-1.el10_1.rocky.0.1 | RLSA-2026:4162 |
| Rocky Linux:9 | rapidjson | 0:1.1.0-19.module+el9.7.0+40027+0df0d4e0 | RLSA-2026:5640 |
| Ubuntu:22.04:LTS | mysql-8.0 | 8.0.45-0ubuntu0.22.04.1 | UBUNTU-CVE-2026-21941 |
| Ubuntu:22.04:LTS | mysql-8.0 | 8.0.45-0ubuntu0.22.04.1 | USN-7994-1 |
| Ubuntu:24.04:LTS | mysql-8.0 | 8.0.45-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-21941 |
| Ubuntu:24.04:LTS | mysql-8.0 | 8.0.45-0ubuntu0.24.04.1 | USN-7994-1 |
| Ubuntu:25.10 | mysql-8.4 | 8.4.8-0ubuntu0.25.10.1 | USN-7994-1 |
| Ubuntu:25.10 | mysql-8.4 | 8.4.8-0ubuntu0.25.10.1 | UBUNTU-CVE-2026-21941 |
| Ubuntu:26.04:LTS | mysql-8.4 | 8.4.8-0ubuntu1 | UBUNTU-CVE-2026-21941 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Oracle Corporation | MySQL Server | 8.0.0 – through 8.0.448.4.0 – through 8.4.79.0.0 – through 9.5.0 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
References
- Oracle Advisory vendor-advisory