---
id: CVE-2026-55856
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, when a
  Java application connects with sslMode=verify-full or sslMode=verify-ca,
  supplies a pa…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-522
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-2026-55856'
references:
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a
    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-g9jj-cgmh-9f38
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3777370'
    label: security-advisories@github.com
  - url: 'https://jira.mariadb.org/browse/CONJ-1325'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-g9jj-cgmh-9f38'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00347
epssPercentile: 0.25507
aliases:
  - GHSA-g9jj-cgmh-9f38
ecosystem: maven
ingestedAt: '2026-08-28T23:26:57.433Z'
---

## 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, when a Java application connects with sslMode=verify-full or sslMode=verify-ca, supplies a password, and does not configure serverSslCert or trustStore, Connector/J can accept an untrusted self-signed certificate through the fallbackToSystemTrustStore=true ephemeral trust manager and record its certFingerprint for later identity binding. The OK-packet and authentication-switch paths enforce the certificate fingerprint, but the initial-handshake path does not. HandshakeResponse.encode() can therefore build and send a mysql_clear_password response before checking certFingerprint != null && !isMitMProof(), sslMode, or whether the authentication plugin is resistant to a man-in-the-middle, and the initial path also bypasses restrictedAuth. An active man-in-the-middle or hostile server can present a self-signed certificate, claim to be MariaDB, select mysql_clear_password as the initial authentication plugin, and receive the full database password before the connection is rejected. 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-2026-55856)

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-g9jj-cgmh-9f38