MariaDB Connector/J CVE-2026-55857
MEDIUM
GHSA-qxvw-fvwx-5cp7
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
MITM or hostile server required (AC:H); attacker needs no privileges; only credential confidentiality is impacted (C:H, I:N, A:N).
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
MariaDB Connector/J exposes database account passwords in cleartext to on-path attackers or hostile servers when PAM (dialog) authentication is used over plain TCP. The driver's PAM handler (SendPamAuthPacketFactory, plugin name 'dialog') failed to override the requireSsl() gate that correctly protects its sibling mysql_clear_password plugin, inheriting a default value of false and thus omitting the secure-transport requirement. …
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Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following conditions to hold simultaneously. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) correctly captures the central tension: the confidentiality impact is high (full plaintext credential capture) but attack complexity is high because the attacker must occupy an on-path MITM position or control a server the client connects to. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to the patched release on the applicable branch: 2.x users should upgrade to 2.7.14; 3.0-3.3.x users to 3.3.5; 3.4.x users to 3.4.3; 3.5.x users to 3.5.9. … Detailed patch versions, workarounds, and compensating controls in full report. |
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