Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M
CVE-2026-55855MariaDB Connector/Node.js: Possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets
Medium 6.5
In plain English
A medium-severity SQL injection in mariadb-connector-nodejs from mariadb-corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | mariadb | 3.2.4 | GHSA-g5xc-5w98-jfvm |
| npm | mariadb | 3.3.4 | GHSA-g5xc-5w98-jfvm |
| npm | mariadb | 3.4.6 | GHSA-g5xc-5w98-jfvm |
| npm | mariadb | 3.5.3 | GHSA-g5xc-5w98-jfvm |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mariadb-corporation | mariadb-connector-nodejs | < 3.2.4>= 3.3.0, < 3.3.3>= 3.4.0, < 3.4.6>= 3.5.0, < 3.5.3 |
Weakness: CWE-89, CWE-116 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm x_refsource_CONFIRM
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3 x_refsource_MISC
- https://jira.mariadb.org/browse/CONJS-350 x_refsource_MISC