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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55855
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 23:17:08 UTC
Updated2026-08-28 23:17:08 UTC
DescriptionMariaDB 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Problem Types: CWE-89 | CWE-116 | CWE-89 CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') | CWE-116 CWE-116: Improper Encoding or Escaping of Output

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mariadb-corporation Mariadb-connector-nodejs affected < 3.2.4 Not specified
CNA Mariadb-corporation Mariadb-connector-nodejs affected >= 3.3.0, < 3.3.3 Not specified
CNA Mariadb-corporation Mariadb-connector-nodejs affected >= 3.4.0, < 3.4.6 Not specified
CNA Mariadb-corporation Mariadb-connector-nodejs affected >= 3.5.0, < 3.5.3 Not specified

References

ReferenceSourceLinkTags
github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33... [email protected] github.com
jira.mariadb.org/browse/CONJS-350 [email protected] jira.mariadb.org
github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisor... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9ed... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b6... [email protected] github.com
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