Vulnerability · Published Oct 29, 2026 · Assigned by GitHub_M
CVE-2026-119276MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets
Medium 5.9
In plain English
A medium-severity security flaw in mariadb-connector-j from mariadb-corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mariadb-connector-java | no fix listed | DEBIAN-CVE-2026-119276 |
| Debian:13 | mariadb-connector-java | no fix listed | DEBIAN-CVE-2026-119276 |
| Debian:14 | mariadb-connector-java | no fix listed | DEBIAN-CVE-2026-119276 |
| Maven | org.mariadb.jdbc:mariadb-java-client | 3.3.7 | GHSA-h599-m3w5-9m7x |
| Maven | org.mariadb.jdbc:mariadb-java-client | 3.4.5 | GHSA-h599-m3w5-9m7x |
| Maven | org.mariadb.jdbc:mariadb-java-client | 3.5.11 | GHSA-h599-m3w5-9m7x |
| Ubuntu:22.04:LTS | mariadb-connector-java | no fix listed | UBUNTU-CVE-2026-119276 |
| Ubuntu:24.04:LTS | mariadb-connector-java | no fix listed | UBUNTU-CVE-2026-119276 |
| Ubuntu:26.04:LTS | mariadb-connector-java | no fix listed | UBUNTU-CVE-2026-119276 |
| Ubuntu:26.10 | mariadb-connector-java | no fix listed | UBUNTU-CVE-2026-119276 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mariadb-corporation | mariadb-connector-j | >= 3.0.0, < 3.3.7>= 3.4.0, < 3.4.5>= 3.5.0, < 3.5.11 |
Weakness: CWE-130, CWE-789 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-h599-m3w5-9m7x x_refsource_CONFIRM
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/b9e1ee8d9b4d820d70719504cdfd5c97f1aede5f x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/beb445fcf9294113878fc05ac77f0efdf0596ac6 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/ea8c7b6537e50053444188a9a3fd9cae99550f56 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.7 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.5 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.11 x_refsource_MISC