CVE-2026-21964
published 2026-01-20CVE-2026-21964: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versions that are affected are 8.0.0-8.0.44…
PriorityP422medium4.9CVSS 3.1
AVNACLPRHUINSUCNINAH
EPSS
0.34%
25.9th percentile
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). 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
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | mysql-8.0 | < mysql-8.0 8.0.45-1 (sid) | mysql-8.0 8.0.45-1 (sid) |
| oracle | mysql | 8.0.0 – 8.0.44 | — |
| oracle | mysql | 8.4.0 – 8.4.7 | — |
| oracle | mysql | 9.0.0 – 9.5.0 | — |
| oracle_corporation | mysql_server | 8.0.0 – 8.0.44 | — |
| oracle_corporation | mysql_server | 8.4.0 – 8.4.7 | — |
| oracle_corporation | mysql_server | 9.0.0 – 9.5.0 | — |
CVSS provenance
nvdv3.14.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
osv4.9MEDIUM
vendor_debian4.9MEDIUM
vendor_oracle4.9MEDIUM
vendor_redhat4.9MEDIUM
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Ubuntu
MySQL vulnerabilities
vendor_ubuntu·2026-02-03
CVE-2025-53040 MySQL vulnerabilities
Title: MySQL vulnerabilities
Summary: Several security issues were fixed in MySQL.
Multiple security issues were discovered in MySQL and this update includes
a new upstream MySQL version to fix these issues.
MySQL has been updated to 8.0.45 in Ubuntu 20.04 LTS.
In addition to security fixes, the updated packages contain bug fixes, new
features, and possibly incompatible changes.
Please see the following for more information:
https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-45.html
https://www.oracle.com/security-alerts/cpujan2026.html
Instructions: In general, a standard system update will make all the necessary changes.
Ubuntu
MySQL vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2026-21937 MySQL vulnerabilities
Title: MySQL vulnerabilities
Summary: Several security issues were fixed in MySQL.
Multiple security issues were discovered in MySQL and this update includes
new upstream MySQL versions to fix these issues.
MySQL has been updated to 8.0.45 in Ubuntu 22.04 LTS and Ubuntu 24.04 LTS.
Ubuntu 25.10 has been updated to MySQL 8.4.8.
In addition to security fixes, the updated packages contain bug fixes, new
features, and possibly incompatible changes.
Please see the following for more information:
https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-45.html
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-8.html
https://www.oracle.com/security-alerts/cpujan2026.html
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026)
vendor_redhat·2026-01-20·CVSS 4.9
CVE-2026-21964 [MEDIUM] mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026)
mysql: Thread Pooling unspecified vulnerability (CPU Jan 2026)
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). 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).
Oracle CPU describes the issue as following: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versio
Oracle
Oracle Oracle MySQL Risk Matrix: Server: Thread Pooling — CVE-2026-21964
vendor_oracle·2026-01-15·CVSS 4.9
CVE-2026-21964 [MEDIUM] Oracle Oracle MySQL Risk Matrix: Server: Thread Pooling — CVE-2026-21964
Oracle Oracle MySQL Risk Matrix: Server: Thread Pooling vulnerability
CVE: CVE-2026-21964
CVSS: 4.9
Protocol: MySQL Protocol
Remote exploit: No
Affected versions: Network
Advisory: cpujan2026 (JAN 2026)
Debian
CVE-2026-21964: mysql-8.0 - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Th...
vendor_debian·2026·CVSS 4.9
CVE-2026-21964 [MEDIUM] CVE-2026-21964: mysql-8.0 - Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Th...
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). 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).
Scope: local
sid: resolved (fixed in 8.0.45-1)
GHSA
GHSA-jjjh-9j5x-gr7x: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling)
ghsa_unreviewed·2026-01-21
CVE-2026-21964 [MEDIUM] GHSA-jjjh-9j5x-gr7x: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling)
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). 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).
OSV
CVE-2026-21964: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling)
osv·2026-01-20·CVSS 4.9
CVE-2026-21964 [MEDIUM] CVE-2026-21964: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling)
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). 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).
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-21968 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.5
CVE-2026-21968 [MEDIUM] CVE-2026-21968 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21968 :
MySQL vulnerability analysis and mitigation
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).
Source : NVD
## 6.5
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 6.5
Affected Technologies
MySQL
MariaDB Server
Has Public Exploit No
Wiz
CVE-2026-21936 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 4.9
CVE-2026-21936 [MEDIUM] CVE-2026-21936 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21936 :
MySQL vulnerability analysis and mitigation
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).
Source : NVD
## 4.9
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 4.9
Affected Technologies
MySQL
MySQL Cluster
Has Public Exploit No
Has CISA KE
Wiz
CVE-2026-21948 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 4.9
CVE-2026-21948 [MEDIUM] CVE-2026-21948 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21948 :
MySQL vulnerability analysis and mitigation
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).
Source : NVD
## 4.9
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 4.9
Affected Technologies
MySQL
Rocky Linux
Has Public Exploit No
Ha
Wiz
CVE-2026-21964 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 4.9
CVE-2026-21964 [MEDIUM] CVE-2026-21964 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21964 :
MySQL vulnerability analysis and mitigation
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). 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).
Source : NVD
## 4.9
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 4.9
Affected Technologies
MySQL
Rocky Linux
Has Public Exploit N
Wiz
CVE-2026-0994 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.2
CVE-2026-0994 [HIGH] CVE-2026-0994 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-0994 :
MySQL vulnerability analysis and mitigation
A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages.
Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.
Source : NVD
## 8.2
Score
Published January 23, 2026
Severity HIGH
CNA Score 8.2
Affected Technologies
MySQL
Python
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 7.2
Expl
Wiz
CVE-2026-21950 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.2
CVE-2026-21950 [HIGH] CVE-2026-21950 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21950 :
MySQL vulnerability analysis and mitigation
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Source : NVD
## 6.5
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 6.5
Affected Technologies
MySQL
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date
Wiz
CVE-2026-21965 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.2
CVE-2026-21965 [HIGH] CVE-2026-21965 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21965 :
MySQL vulnerability analysis and mitigation
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Pluggable Auth). Supported versions that are affected are 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 partial denial of service (partial DOS) of MySQL Server. CVSS 3.1 Base Score 2.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L).
Source : NVD
## 2.7
Score
Published January 20, 2026
Severity LOW
CNA Score 2.7
Affected Technologies
MySQL
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CI
Wiz
CVE-2026-21929 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.2
CVE-2026-21929 [HIGH] CVE-2026-21929 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21929 :
MySQL vulnerability analysis and mitigation
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Parser). Supported versions that are affected are 9.0.0-9.5.0. Difficult to exploit 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 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H).
Source : NVD
## 5.3
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 5.3
Affected Technologies
MySQL
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date
Wiz
CVE-2026-21952 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.2
CVE-2026-21952 [HIGH] CVE-2026-21952 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21952 :
MySQL vulnerability analysis and mitigation
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Parser). Supported versions that are affected are 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).
Source : NVD
## 4.9
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 4.9
Affected Technologies
MySQL
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N
Wiz
CVE-2026-21949 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.2
CVE-2026-21949 [HIGH] CVE-2026-21949 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21949 :
MySQL vulnerability analysis and mitigation
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Source : NVD
## 6.5
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 6.5
Affected Technologies
MySQL
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date
Wiz
CVE-2026-21941 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 4.9
CVE-2026-21941 [MEDIUM] CVE-2026-21941 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21941 :
MySQL vulnerability analysis and mitigation
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).
Source : NVD
## 4.9
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 4.9
Affected Technologies
MySQL
Rocky Linux
Has Public Exploit No
Ha
Wiz
CVE-2026-21937 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 4.9
CVE-2026-21937 [MEDIUM] CVE-2026-21937 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21937 :
MySQL vulnerability analysis and mitigation
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DDL). 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).
Source : NVD
## 4.9
Score
Published January 20, 2026
Severity MEDIUM
CNA Score 4.9
Affected Technologies
MySQL
Rocky Linux
Has Public Exploit No
Has CISA
2026-01-20
Published