---
id: CVE-2026-55858
title: >-
  MariaDB Connector/J is used to connect applications developed in Java to
  MariaDB and MySQL databases
summary: >-
  MariaDB Connector/J is used to connect applications developed in Java to
  MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, the
  connector encodes and decodes protocol text and performs client-side escaping
  under the a…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-838
vendor: mariadb
product: 'org.mariadb.jdbc:mariadb-java-client'
affected:
  - 'org.mariadb.jdbc:mariadb-java-client < 2.7.14'
  - 'org.mariadb.jdbc:mariadb-java-client >= 3.0.0, < 3.3.5'
  - 'org.mariadb.jdbc:mariadb-java-client >= 3.4.0, < 3.4.3'
  - 'org.mariadb.jdbc:mariadb-java-client >= 3.5.0, < 3.5.9'
patched:
  - 'org.mariadb.jdbc:mariadb-java-client 2.7.14'
  - 'org.mariadb.jdbc:mariadb-java-client 3.3.5'
  - 'org.mariadb.jdbc:mariadb-java-client 3.4.3'
  - 'org.mariadb.jdbc:mariadb-java-client 3.5.9'
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:08:37.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55858'
references:
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/commit/7b3c69221b5463ee03472654040b3f6b9e5329c7
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/commit/8cfd9df697372ad4ed09fe87a34b34babb6d43d6
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/2.7.14
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.5
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9
    label: security-advisories@github.com
  - url: 'https://jira.mariadb.org/browse/CONJ-1317'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-xvr9-35cr-46v9'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00344
epssPercentile: 0.27893
aliases:
  - GHSA-xvr9-35cr-46v9
ecosystem: maven
ingestedAt: '2026-08-28T23:26:57.354Z'
---

## Overview

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, the connector encodes and decodes protocol text and performs client-side escaping under the assumption that the connection character set is UTF-8. The server can report a mid-session change to character_set_client through OK-packet session-state tracking, including a change caused by SET NAMES, a stored routine or trigger, server configuration, or a hostile server. If character_set_client changes to a non-UTF-8 value, the driver continues to read and write UTF-8 while the server interprets the same bytes under another encoding, causing silent data corruption and a client/server charset-confusion mismatch that can defeat byte-wise quoting or escaping. The fix accepts only utf8, utf8mb3, or utf8mb4 after initialization; any other value causes SQLException with SQLState 08000 and closes the connection. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55858)

Affected packages:

- `org.mariadb.jdbc:mariadb-java-client < 2.7.14`
- `org.mariadb.jdbc:mariadb-java-client >= 3.0.0, < 3.3.5`
- `org.mariadb.jdbc:mariadb-java-client >= 3.4.0, < 3.4.3`
- `org.mariadb.jdbc:mariadb-java-client >= 3.5.0, < 3.5.9`

Patched in:

- `org.mariadb.jdbc:mariadb-java-client 2.7.14`
- `org.mariadb.jdbc:mariadb-java-client 3.3.5`
- `org.mariadb.jdbc:mariadb-java-client 3.4.3`
- `org.mariadb.jdbc:mariadb-java-client 3.5.9`

Source: https://github.com/advisories/GHSA-xvr9-35cr-46v9