CVE-2026-119276 MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-119276?
CVE-2026-119276 is a medium-severity vulnerability in mariadb-corporation mariadb-connector-j, published on 29 Oct 2026.
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.
Which versions are affected by CVE-2026-119276?
How do I fix CVE-2026-119276?
No fix has been published for CVE-2026-119276 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-119276 being exploited?
There is no known exploitation of CVE-2026-119276 in the wild and no public exploit code.