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[ CVE-2026-119276 · Published 29 Oct 2026 ]

MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets

CVSS 5.9 EPSS <1%1 agency advisoryFix available

[ Description ]Official description

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7, 3.4.5, and 3.5.11, when CLIENT_SESSION_TRACK was negotiated, the OkPacket.parse() and OkPacket.parseWithInfo() paths allocated byte arrays using server-declared lengths for the OK packet info field and session-state variable names and values before confirming that the bytes remained in the packet. A malicious or compromised server, or a machine-in-the-middle attacker, could send a small OK packet declaring a much larger length and repeatedly force attacker-controlled heap allocations before the subsequent copy failed. This could create garbage-collection pressure or an OutOfMemoryError in the client application. This issue is fixed in versions 3.3.7, 3.4.5, and 3.5.11.

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

[ Packages ]Affected open-source packages

  • org.mariadb.jdbc:mariadb-java-client mavenAffected >= 3.0.0, < 3.3.7 · fixed in 3.3.7 · GHSA-h599-m3w5-9m7x
  • org.mariadb.jdbc:mariadb-java-client mavenAffected >= 3.4.0, < 3.4.5 · fixed in 3.4.5 · GHSA-h599-m3w5-9m7x
  • org.mariadb.jdbc:mariadb-java-client mavenAffected >= 3.5.0, < 3.5.11 · fixed in 3.5.11 · GHSA-h599-m3w5-9m7x

[ References ]References