CVE-2026-119278 MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-119278?
CVE-2026-119278 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 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.
Which versions are affected by CVE-2026-119278?
How do I fix CVE-2026-119278?
No fix has been published for CVE-2026-119278 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-119278 being exploited?
There is no known exploitation of CVE-2026-119278 in the wild and no public exploit code.