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CVE-2026-55855— MariaDB Connector/Node.js: Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets

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，该漏洞源于在big5、gbk、sjis、cp932或gb18030客户端字符集下转义攻击者控制的Buffer参数时未使用字符集感知的getMbRecognizer逻辑，可能导致SQL注入，成功利用可暴露或修改数据库账户可访问的数据。

CVSS 6.5 · Medium EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-55855

Vulnerability Information
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Vulnerability Title
MariaDB Connector/Node.js: Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets
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 permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. 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:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
MariaDB R2DBC connector 输出处理不当漏洞
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，该漏洞源于在big5、gbk、sjis、cp932或gb18030客户端字符集下转义攻击者控制的Buffer参数时未使用字符集感知的getMbRecognizer逻辑，可能导致SQL注入，成功利用可暴露或修改数据库账户可访问的数据。
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-2026-55855

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III. Intelligence Information for CVE-2026-55855

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Patches & Fixes for CVE-2026-55855 (4)

Vendor Advisories for CVE-2026-55855 (1)

Vendor Pages for CVE-2026-55855 (5)

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-2026-55854 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-2026-55857 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-89

V. Comments for CVE-2026-55855

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