---
id: CVE-2026-55855
title: >-
  MariaDB Connector/Node.js is used to connect applications developed on Node.js
  to MariaDB and MySQL databases
summary: >-
  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 param…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-89
  - CWE-116
vendor: mariadb
product: mariadb
affected:
  - mariadb < 3.2.4
  - 'mariadb >= 3.3.0, < 3.3.3'
  - 'mariadb >= 3.4.0, < 3.4.6'
  - 'mariadb >= 3.5.0, < 3.5.3'
patched:
  - mariadb 3.2.4
  - mariadb 3.3.4
  - mariadb 3.4.6
  - mariadb 3.5.3
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:08:37.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55855'
references:
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-g5xc-5w98-jfvm
    label: security-advisories@github.com
  - url: 'https://jira.mariadb.org/browse/CONJS-350'
    label: security-advisories@github.com
  - url: >-
      https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/0148cadba48064d430902678bbc5b4b62dc1c04f
  - url: 'https://github.com/advisories/GHSA-g5xc-5w98-jfvm'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00471
epssPercentile: 0.38016
aliases:
  - GHSA-g5xc-5w98-jfvm
ecosystem: npm
ingestedAt: '2026-08-28T23:26:57.172Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55855)

Affected packages:

- `mariadb < 3.2.4`
- `mariadb >= 3.3.0, < 3.3.3`
- `mariadb >= 3.4.0, < 3.4.6`
- `mariadb >= 3.5.0, < 3.5.3`

Patched in:

- `mariadb 3.2.4`
- `mariadb 3.3.4`
- `mariadb 3.4.6`
- `mariadb 3.5.3`

Source: https://github.com/advisories/GHSA-g5xc-5w98-jfvm