MariaDB Connector/Node.js up to 3.2.3/3.3.2/3.4.5/3.5.2 Packet Output Stream packet-output-stream.js PacketOutputStream.writeBufferEscape Buffer sql injection

Summaryinfo

A vulnerability was found in MariaDB Connector and Node.js up to 3.2.3/3.3.2/3.4.5/3.5.2. It has been declared as critical. This affects the function PacketOutputStream.writeBufferEscape of the file lib/io/packet-output-stream.js of the component Packet Output Stream. The manipulation of the argument Buffer results in sql injection. This vulnerability was named CVE-2026-55855. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in MariaDB Connector and Node.js up to 3.2.3/3.3.2/3.4.5/3.5.2. Affected is the function PacketOutputStream.writeBufferEscape of the file lib/io/packet-output-stream.js of the component Packet Output Stream. The manipulation of the argument Buffer with an unknown input leads to a sql injection vulnerability. CWE is classifying the issue as CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-55855 since 06/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1505.

Upgrading to version 3.2.4, 3.3.3, 3.4.6 or 3.5.3 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• JavaScript Library

Vendor

• MariaDB

Name

• Connector
• Node.js

Version

• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.3.0
• 3.3.1
• 3.3.2
• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.5.0
• 3.5.1
• 3.5.2

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion