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CVE-2026-55854— MariaDB Connector/Node.js: Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials in mariadb

Quick assessment

Affected
mariadb-corporation mariadb-connector-nodejs
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 3.2.4之前版本、3.3.3之前版本、3.4.6之前版本和3.5.3之前版本存在安全漏洞，该漏洞源于lib/cmd/handshake/auth/pam-password-auth.js和lib/cmd/handshake/authentication.js中的SendPamAuthPacketFactory行为缺少安全传输门控，可能导致在不安全传输上通过P

CVSS 5.9 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 4

VendorProduct Version RangeStatus
mariadb-corporation mariadb-connector-nodejs < 3.2.4 affected
>= 3.3.0, < 3.3.3 affected
>= 3.4.0, < 3.4.6 affected
>= 3.5.0, < 3.5.3 affected
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I. Basic Information for CVE-2026-55854

Vulnerability Information
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Vulnerability Title
MariaDB Connector/Node.js: Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials in mariadb
Source: CVE Program / CVE List V5
Vulnerability Description
MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js can disclose an account password when PAM dialog authentication is negotiated over an insecure transport. In lib/cmd/handshake/auth/pam-password-auth.js and lib/cmd/handshake/authentication.js, the SendPamAuthPacketFactory behavior for the server-side plugin dialog lacked the secure-transport gate applied to mysql_clear_password. With the default sslMode=DISABLE and restrictedAuth=null settings, a hostile or on-path server can send an Authentication Switch Request for dialog over plain TCP, causing the connector to return the account password in cleartext. Properly verified TLS and a local Unix socket prevent this path, while fingerprint-only server identity validation is not sufficient. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3.
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 3.2.4之前版本、3.3.3之前版本、3.4.6之前版本和3.5.3之前版本存在安全漏洞，该漏洞源于lib/cmd/handshake/auth/pam-password-auth.js和lib/cmd/handshake/authentication.js中的SendPamAuthPacketFactory行为缺少安全传输门控，可能导致在不安全传输上通过P
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-nodejs < 3.2.4 -

II. Public POCs for CVE-2026-55854

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III. Intelligence Information for CVE-2026-55854

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Patches & Fixes for CVE-2026-55854 (4)

Vendor Advisories for CVE-2026-55854 (1)

Vendor Pages for CVE-2026-55854 (4)

Other References for CVE-2026-55854 (1)

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-2026-55856 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-2026-55857 5.9 MEDIUM MariaDB Connector/J: Cleartext Transmission of Sensitive Information and Insufficiently Pr
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-nodejs
Same vendor: mariadb-corporation
Same weakness: CWE-319

V. Comments for CVE-2026-55854

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