CVE-2026-21949

CWE-400 — Uncontrolled Resource Consumption8 documents8 sources
Severity
6.5MEDIUM
EPSS
0.1%
top 83.41%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Oracle Corporation Mysql ServerOracle Mysql Server
Timeline
PublishedJan 20
Latest updateJan 21

Description

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 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…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages2 packages

▶NVDoracle/mysql_server9.0.0 — 9.5.0
▶CVEListV5oracle_corporation/mysql_server9.0.0 — 9.5.0

🔴Vulnerability Details

3
GHSA
GHSA-5874-2h56-xqh9: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer)↗2026-01-21
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OSV
CVE-2026-21949: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer)↗2026-01-20
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CVEList
CVE-2026-21949: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer)↗2026-01-20
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📋Vendor Advisories

3
Red Hat
mysql: Optimizer unspecified vulnerability (CPU Jan 2026)↗2026-01-20
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Oracle
Oracle Oracle MySQL Risk Matrix: Server: Optimizer — CVE-2026-21949↗2026-01-15
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Debian
CVE-2026-21949: mysql-8.0 - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Op...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-21949 Impact, Exploitability, and Mitigation Steps | Wiz↗
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