# CVE-2026-119279: MariaDB Connector/J integer overflow in length encoding

Source: https://junglewise.ai/threats/cve-2026-119279-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-2026-119279 · Severity: medium · CVSS 5.9 · Published 2026-10-29

MariaDB Connector/J is a Java library that applications use to connect to MariaDB and MySQL databases. A malicious or compromised database server could send specially crafted protocol messages that cause the client to crash with memory allocation errors or read incorrect amounts of data, potentially leading to data corruption or application instability.

Technologies: [MariaDB Connector/J](https://junglewise.ai/threats/technologies/mariadb-connector-j), [org.mariadb.jdbc:mariadb-java-client (Maven)](https://junglewise.ai/threats/technologies/org-mariadb-jdbc-mariadb-java-client). Vendors: [Mariadb](https://junglewise.ai/threats/vendors/mariadb), [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2026-119279 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119279 being exploited in the wild.

**How severe is CVE-2026-119279?** 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, 3.5.0 to 3.5.9; org.mariadb.jdbc:mariadb-java-client (Maven) >= 3.0.0, < 3.3.7, ECOSYSTEM:introduced=3.0.0,fixed=3.3.7.

**Is there a fix for CVE-2026-119279?** Yes. org.mariadb.jdbc:mariadb-java-client (Maven): upgrade to 3.3.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-119279 attacked?** It is attacked over the network or from the adjacent network, in a software library.

**Am I affected by CVE-2026-119279?** Check whether you run MariaDB Connector/J or org.mariadb.jdbc:mariadb-java-client (Maven) 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

- org.mariadb.jdbc:mariadb-java-client (Maven): upgrade to 3.3.7 or later

  ```sh
  # set org.mariadb.jdbc:mariadb-java-client to 3.3.7 in your pom.xml or build.gradle
  ```


## Technical details

The readLength() and readIntLengthEncodedNotNull() methods in ReadableByteBuf failed to validate that protocol-level unsigned 8-byte length-encoded integers fit within Java's non-negative int range, allowing values above Integer.MAX_VALUE to wrap to negative values. These wrapped values are then passed directly to downstream allocation and read operations, triggering NegativeArraySizeException, out-of-bounds access, or oversized memory allocation. A machine-in-the-middle or malicious database server can trigger this during any client connection.

## Affected products

- MariaDB Connector/J 3.0.0 to 3.3.6, 3.4.0 to 3.4.4, 3.5.0 to 3.5.9

## Identifiers

- CVE-2026-119279
- GHSA-797x-p4mc-jwpm

## Timeline

- 2026-10-29: advisory

## References

- [https://github.com/mariadb-corporation/mariadb-connector-j/commit/30d4a883377a9b7762e02ee2c60d54567032ab99](https://github.com/mariadb-corporation/mariadb-connector-j/commit/30d4a883377a9b7762e02ee2c60d54567032ab99)
- [https://github.com/mariadb-corporation/mariadb-connector-j/commit/bfd9f5ad666a6f7f5401a5b78f2ac2fbd6df8667](https://github.com/mariadb-corporation/mariadb-connector-j/commit/bfd9f5ad666a6f7f5401a5b78f2ac2fbd6df8667)

## 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: XA recover() trusted server-supplied gtrid and bqual lengths](https://junglewise.ai/threats/cve-2026-119280-mariadb-connector-j-is-used-to-connect-applications-developed-in)
- [MariaDB Connector/J array index out of bounds in caching_sha2_password](https://junglewise.ai/threats/cve-2026-119278-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)