MariaDB Connector/J up to 2.7.13/3.3.4/3.4.2/3.5.8 PAM handler SendPamAuthPacketFactory sslMode/restrictedAuth channel accessible

Summaryinfo

A vulnerability labeled as problematic has been found in MariaDB Connector and J up to 2.7.13/3.3.4/3.4.2/3.5.8. Affected by this issue is the function SendPamAuthPacketFactory of the component PAM handler. Such manipulation of the argument sslMode/restrictedAuth leads to channel accessible. This vulnerability is referenced as CVE-2026-55857. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in MariaDB Connector and J up to 2.7.13/3.3.4/3.4.2/3.5.8. It has been rated as problematic. Affected by this issue is the function SendPamAuthPacketFactory of the component PAM handler. The manipulation of the argument sslMode/restrictedAuth with an unknown input leads to a channel accessible vulnerability. Using CWE to declare the problem leads to CWE-300. The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint. Impacted is confidentiality. CVE summarizes:

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, PAM dialog authentication can be coerced into transmitting the account password over an insecure connection. The mysql_clear_password plugin is gated behind a secure transport, but the sibling PAM handler SendPamAuthPacketFactory, named dialog by the server, does not declare that requirement and inherits the default secure-required value false; older branches implement the same affected behavior in SendPamAuthPacket. A hostile or man-in-the-middle server can send an Authentication Switch Request for dialog over plain TCP, causing the driver to return the user's password in cleartext when sslMode=DISABLE and restrictedAuth=null, which is the default configuration. Properly verified TLS and local Unix sockets are not exposed to this transport vector. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55857 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1557.

Upgrading to version 2.7.14, 3.3.5, 3.4.3 or 3.5.9 eliminates this vulnerability.

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Productinfo

Type

• Database Software

Vendor

• MariaDB

Name

• Connector
• J

Version

• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7
• 2.7.8
• 2.7.9
• 2.7.10
• 2.7.11
• 2.7.12
• 2.7.13
• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.4.0
• 3.4.1
• 3.4.2
• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6
• 3.5.7
• 3.5.8

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

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