CVE-2026-55855

MEDIUM
Published Aug 28, 2026 Modified Aug 31, 2026 CWE-89 CWE-116

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.

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CVSS v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0031
Probability of exploitation
0.24%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-89 SQL Injection
CWE-116 CWE-116

References

Other References

https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468 https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2 https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3 https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3 https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm https://jira.mariadb.org/browse/CONJS-350

Frequently Asked Questions

What is CVE-2026-55855? +
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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2026-55855? +
CVE-2026-55855 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0031, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-55855? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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