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CVE-2026-55857— MariaDB Connector/J: Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials

Quick assessment

Affected
mariadb-corporation mariadb-connector-j
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MariaDB R2DBC connector是MariaDB基金会的一款关系数据库响应式连接器。 MariaDB R2DBC connector 2.7.14之前版本、3.0.0至3.3.5之前版本、3.4.0至3.4.3之前版本和3.5.0至3.5.9之前版本存在安全漏洞，该漏洞源于PAM dialog认证机制未正确声明安全传输要求，继承默认的secure-required值为false，当sslMode=DISABLE且restrictedAuth=null时，中间人攻击者可通过明文TCP发送认证切

CVSS 5.9 · Medium EPSS 0.39% · P31

Affected Version Matrix 4

VendorProduct Version RangeStatus
mariadb-corporation mariadb-connector-j < 2.7.14 affected
>= 3.0.0, < 3.3.5 affected
>= 3.4.0, < 3.4.3 affected
>= 3.5.0, < 3.5.9 affected
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I. Basic Information for CVE-2026-55857

Vulnerability Information
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Vulnerability Title
MariaDB Connector/J: Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials
Source: CVE Program / CVE List V5
Vulnerability Description
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, PAM dialog authentication can be coerced into transmitting the account password over an insecure connection. The mysql_clear_password plugin is gated behind a secure transport, but the sibling PAM handler SendPamAuthPacketFactory, named dialog by the server, does not declare that requirement and inherits the default secure-required value false; older branches implement the same affected behavior in SendPamAuthPacket. A hostile or man-in-the-middle server can send an Authentication Switch Request for dialog over plain TCP, causing the driver to return the user's password in cleartext when sslMode=DISABLE and restrictedAuth=null, which is the default configuration. Properly verified TLS and local Unix sockets are not exposed to this transport vector. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5
Vulnerability Title
MariaDB R2DBC connector 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MariaDB R2DBC connector是MariaDB基金会的一款关系数据库响应式连接器。 MariaDB R2DBC connector 2.7.14之前版本、3.0.0至3.3.5之前版本、3.4.0至3.4.3之前版本和3.5.0至3.5.9之前版本存在安全漏洞，该漏洞源于PAM dialog认证机制未正确声明安全传输要求，继承默认的secure-required值为false，当sslMode=DISABLE且restrictedAuth=null时，中间人攻击者可通过明文TCP发送认证切
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mariadb-corporation mariadb-connector-j < 2.7.14 -

II. Public POCs for CVE-2026-55857

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III. Intelligence Information for CVE-2026-55857

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Patches & Fixes for CVE-2026-55857 (2)

Vendor Advisories for CVE-2026-55857 (1)

Vendor Pages for CVE-2026-55857 (3)

Same Patch Batch · mariadb-corporation · 2026-08-28 · 8 CVEs total

CVE-2026-55215 7.5 HIGH MariaDB Connector/Node.js: Connector leaks the cleartext password to an MitM despite `ssl:
CVE-2026-55855 6.5 MEDIUM MariaDB Connector/Node.js: Possible SQL injection in Buffer parameter escaping under big5/
CVE-2026-55854 5.9 MEDIUM MariaDB Connector/Node.js: Cleartext Transmission of Sensitive Information and Insufficien
CVE-2026-55856 5.9 MEDIUM MariaDB Connector/J: Cleartext password disclosure to a MITM on the initial-handshake
CVE-2026-55860 5.9 MEDIUM MariaDB Connector/R2DBC: Cleartext password disclosure to a man-in-the-middle server (clea
CVE-2026-55859 5.9 MEDIUM MariaDB Connector/R2DBC: Inappropriate Encoding for Output Context and Improper Encoding o
CVE-2026-55858 5.9 MEDIUM MariaDB Connector/J: Inappropriate Encoding for Output Context in org.mariadb.jdbc:mariadb

IV. Related Vulnerabilities

Same product: mariadb-connector-j
Same vendor: mariadb-corporation
Same weakness: CWE-319

V. Comments for CVE-2026-55857

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