# CVE-2026-46863: libmysqlclient21: Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Connection Handling)

CVE-2026-46863 is fixed in 15 products on 1 platform, first by libmysqlclient24 8.4.10-0ubuntu0.26.04.1, released June 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-46863
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 17, 2026

## Description

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Connection Handling).  Supported versions that are affected are MySQL Server: 8.4.0-8.4.9, 9.0.0-9.7.0; MySQL Cluster: 8.0.11-8.0.46, 8.4.0-8.4.9 and  9.0.0-9.7.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 7.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmysqlclient21 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [libmysqlclient21 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmysqlclient21-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | libmysqlclient21 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [libmysqlclient21 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmysqlclient21-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | libmysqlclient21 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [libmysqlclient21 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libmysqlclient21-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | libmysqlclient24 Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [libmysqlclient24 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libmysqlclient24-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | libmysqlclient24 Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [libmysqlclient24 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libmysqlclient24-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-client Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-client 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-client Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-client 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-client Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-client 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-client-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-client Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-client 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-client-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-client Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-client 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-client-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-client-8.0 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-client-8.0 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-8.0-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-client-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-client-8.0 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-8.0-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-client-8.0 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-client-8.0 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-client-8.0-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-client-core Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-client-core 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-client-core-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-client-core Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-client-core 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-client-core-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-client-core-8.0 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-client-core-8.0 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-core-8.0-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-client-core-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-client-core-8.0 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-core-8.0-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-client-core-8.0 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-client-core-8.0 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-client-core-8.0-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-router Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-router 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-router-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-router Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-router 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-router-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-router Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-router 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-router-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-router Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-router 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-router-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-router Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-router 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-router-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-server Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-server 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-server Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-server 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-server Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-server 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-server-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-server Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-server 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-server-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-server Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-server 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-server-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-server-8.0 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-server-8.0 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-8.0-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-server-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-server-8.0 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-8.0-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-server-8.0 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-server-8.0 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-server-8.0-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-server-core Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-server-core 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-server-core-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-server-core Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-server-core 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-server-core-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-server-core-8.0 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-server-core-8.0 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-core-8.0-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-server-core-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-server-core-8.0 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-core-8.0-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-server-core-8.0 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-server-core-8.0 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-server-core-8.0-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-source Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-source 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-source-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-source Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-source 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-source-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-source-8.0 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-source-8.0 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-source-8.0-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-source-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-source-8.0 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-source-8.0-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-source-8.0 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-source-8.0 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-source-8.0-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-testsuite Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-testsuite 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-testsuite-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-testsuite Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-testsuite 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-testsuite-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-testsuite Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-testsuite 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-testsuite-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |
| Linux | mysql-testsuite Ubuntu 25.10 (questing) | 8.4.10-0ubuntu0.25.10.1 | [mysql-testsuite 8.4.10-0ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-mysql-testsuite-8.4.10-0ubuntu0.25.10.1.md) | Jun 24, 2026 |
| Linux | mysql-testsuite Ubuntu 26.04.1 LTS (resolute) | 8.4.10-0ubuntu0.26.04.1 | [mysql-testsuite 8.4.10-0ubuntu0.26.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-mysql-testsuite-8.4.10-0ubuntu0.26.04.1.md) | Jun 18, 2026 |
| Linux | mysql-testsuite-8.0 Ubuntu 20.04 LTS (focal) | 8.0.46-0ubuntu0.20.04.1+esm3 | [mysql-testsuite-8.0 8.0.46-0ubuntu0.20.04.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-testsuite-8.0-8.0.46-0ubuntu0.20.04.1-esm3.md) | Jun 25, 2026 |
| Linux | mysql-testsuite-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.46-0ubuntu0.22.04.3 | [mysql-testsuite-8.0 8.0.46-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-testsuite-8.0-8.0.46-0ubuntu0.22.04.3.md) | Jun 24, 2026 |
| Linux | mysql-testsuite-8.0 Ubuntu 24.04.5 LTS (noble) | 8.0.46-0ubuntu0.24.04.3 | [mysql-testsuite-8.0 8.0.46-0ubuntu0.24.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-mysql-testsuite-8.0-8.0.46-0ubuntu0.24.04.3.md) | Jun 24, 2026 |

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