# CVE-2026-119276: MariaDB Connector/J heap allocation denial of service

Source: https://junglewise.ai/threats/cve-2026-119276-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-2026-119276 · Severity: medium · CVSS 5.9 · Published 2026-10-29

MariaDB Connector/J is a library that allows Java applications to connect to MariaDB and MySQL databases. When communicating with a malicious or compromised database server, the connector can be forced to repeatedly allocate large amounts of memory based on server-supplied packet sizes, causing garbage collection pressure or application crashes due to out-of-memory errors.

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-2026-119276 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119276 being exploited in the wild.

**How severe is CVE-2026-119276?** 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 3.5.10; 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-2026-119276?** 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-2026-119276 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-119276?** 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 vulnerability exists in the OkPacket.parse() and OkPacket.parseWithInfo() code paths when CLIENT_SESSION_TRACK capability negotiation is enabled. The parser reads server-declared lengths from the OK packet's info field and session-state variable names/values, then allocates byte arrays before validating that the declared bytes remain in the packet. A network-based attacker controlling the database server can send malformed OK packets with exaggerated length declarations to trigger repeated heap allocations, exhausting client memory.

## Affected products

- MariaDB Connector/J 3.0.0 to 3.3.6, 3.4.0 to 3.4.4, 3.5.0 to 3.5.10

## Identifiers

- CVE-2026-119276
- GHSA-h599-m3w5-9m7x

## Timeline

- 2026-10-29: disclosed

## References

- [https://github.com/mariadb-corporation/mariadb-connector-j/commit/b9e1ee8d9b4d820d70719504cdfd5c97f1aede5f](https://github.com/mariadb-corporation/mariadb-connector-j/commit/b9e1ee8d9b4d820d70719504cdfd5c97f1aede5f)
- [https://github.com/mariadb-corporation/mariadb-connector-j/commit/beb445fcf9294113878fc05ac77f0efdf0596ac6](https://github.com/mariadb-corporation/mariadb-connector-j/commit/beb445fcf9294113878fc05ac77f0efdf0596ac6)

## 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 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 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)