# CVE-2026-119278: MariaDB Connector/J array index out of bounds in caching_sha2_password

Source: https://junglewise.ai/threats/cve-2026-119278-mariadb-connector-j-is-used-to-connect-applications-developed-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-29. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-119278 · Severity: medium · CVSS 5.9 · Published 2026-10-29

MariaDB Connector/J is a Java library that enables applications to connect to MariaDB and MySQL databases. A malicious or compromised database server can send a malformed authentication response that causes the connector to crash with an unchecked exception, leading to denial of service for applications relying on this connection library.

Technologies: [MariaDB Connector/J](https://junglewise.ai/threats/technologies/mariadb-connector-j). Vendors: [Mariadb](https://junglewise.ai/threats/vendors/mariadb).

## Quick answers

**Is CVE-2026-119278 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119278 being exploited in the wild.

**How severe is CVE-2026-119278?** Medium severity, with a CVSS score of 5.9, published 29 October 2026.

**Which products and versions are affected?** MariaDB Connector/J 3.0.0 to 3.3.6, 3.4.0 to 3.4.4.

**Is there a fix for CVE-2026-119278?** Yes: fixed in Connector/J 3.3.7, 3.4.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-119278 attacked?** It is attacked over the network or from the adjacent network.

**Am I affected by CVE-2026-119278?** Check whether you run MariaDB Connector/J at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Connector/J 3.3.7, 3.4.5

## Technical details

During caching_sha2_password authentication, the connector incorrectly processes the authentication-more-data response by treating it as a length-encoded byte array and accessing authResult[0] without validating that bytes exist. An attacker controlling or intercepting the database connection can declare an excessive length or send an empty response, triggering either excessive memory allocation or an ArrayIndexOutOfBoundsException that escapes DriverManager.getConnection().

## Affected products

- MariaDB Connector/J 3.0.0 to 3.3.6, 3.4.0 to 3.4.4

## References

- [https://github.com/mariadb-corporation/mariadb-connector-j/commit/1e32b7010485f090cc402528c334301432495fbe](https://github.com/mariadb-corporation/mariadb-connector-j/commit/1e32b7010485f090cc402528c334301432495fbe)
- [https://github.com/mariadb-corporation/mariadb-connector-j/commit/86a90b0dc9746aa3bd4aa1df264be22a2d1b7d98](https://github.com/mariadb-corporation/mariadb-connector-j/commit/86a90b0dc9746aa3bd4aa1df264be22a2d1b7d98)

## Related threats

- [MariaDB Connector/J character set validation bypass](https://junglewise.ai/threats/cve-2026-119281-mariadb-connector-j-is-used-to-connect-applications-developed-in)
- [MariaDB Connector/J integer overflow in length encoding](https://junglewise.ai/threats/cve-2026-119279-mariadb-connector-j-is-used-to-connect-applications-developed-in)
- [MariaDB Connector/J buffer overflow in packet decoding](https://junglewise.ai/threats/cve-2026-119277-mariadb-connector-j-is-used-to-connect-applications-developed-in)
- [MariaDB Connector/J heap allocation denial of service](https://junglewise.ai/threats/cve-2026-119276-mariadb-connector-j-is-used-to-connect-applications-developed-in)
- [MariaDB Connector/J LOAD DATA LOCAL INFILE bypass in metadata queries](https://junglewise.ai/threats/cve-2026-119210-mariadb-connector-j-is-used-to-connect-applications-developed-in)