Answer in brief
CVE-2026-55857 records a Medium severity (CVSS 5.9) vulnerability in MariaDB Connector/J: Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials. The current sources do not mark it as known exploited. The current feed maps mariadb-corporation/mariadb-connector-j (generic), org.mariadb.jdbc:mariadb-java-client (maven), org.mariadb.jdbc:mariadb-java-client (maven), org.mariadb.jdbc:mariadb-java-client (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps mariadb-corporation/mariadb-connector-j (generic), org.mariadb.jdbc:mariadb-java-client (maven), org.mariadb.jdbc:mariadb-java-client (maven), org.mariadb.jdbc:mariadb-java-client (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| mariadb-corporation/mariadb-connector-jgeneric | < 2.7.14 || >= 3.0.0, < 3.3.5 || >= 3.4.0, < 3.4.3 || >= 3.5.0, < 3.5.9 | Not reported |
| org.mariadb.jdbc:mariadb-java-clientmaven | <2.7.14 | 2.7.14 |
| org.mariadb.jdbc:mariadb-java-clientmaven | >=3.0.0,<3.3.5 | 3.3.5 |
| org.mariadb.jdbc:mariadb-java-clientmaven | >=3.4.0,<3.4.3 | 3.4.3 |
| org.mariadb.jdbc:mariadb-java-clientmaven | >=3.5.0,<3.5.9 | 3.5.9 |
Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.