MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-119276
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 21:17:20 UTC
Updated2026-10-29 21:17:20 UTC
DescriptionMariaDB 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-130 | CWE-789 | CWE-130 CWE-130: Improper Handling of Length Parameter Inconsistency | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mariadb-corporation Mariadb-connector-j affected >= 3.0.0, < 3.3.7 Not specified
CNA Mariadb-corporation Mariadb-connector-j affected >= 3.4.0, < 3.4.5 Not specified
CNA Mariadb-corporation Mariadb-connector-j affected >= 3.5.0, < 3.5.11 Not specified

References

ReferenceSourceLinkTags
github.com/mariadb-corporation/mariadb-connector-j/commit/beb445fcf92941... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.7 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.11 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.5 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-j/security/advisories/G... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-j/commit/b9e1ee8d9b4d82... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-j/commit/ea8c7b6537e500... [email protected] github.com
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