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CVE-2026-119276— MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets

Quick assessment

Affected
mariadb-corporation mariadb-connector-j
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MariaDB Connector/J 用于将 Java 开发的应用程序连接到 MariaDB 和 MySQL 数据库。在 3.0.0 至 3.3.7、3.4.5 和 3.5.11 版本中，当协商启用 CLIENT_SESSION_TRACK 时，OkPacket.parse() 和 OkPacket.parseWithInfo() 代码路径会在确认字节仍存在于数据包之前，依据服务器声明的长度为 OK 数据包的信息字段以及会话状态变量的名称和值分配字节数组。恶意或已被攻陷的服务器，或实施中间人攻击的攻击者，可发送一

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-119276

Vulnerability Information
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Vulnerability Title
MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared lengths in OK packets
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
长度参数不一致性处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mariadb-corporation mariadb-connector-j >= 3.0.0, < 3.3.7 -

II. Public POCs for CVE-2026-119276

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III. Intelligence Information for CVE-2026-119276

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Other References for CVE-2026-119276 (7)

Same Patch Batch · mariadb-corporation · 2026-10-29 · 7 CVEs total

CVE-2026-119210 5.9 MEDIUM MariaDB Connector/J: LOAD DATA LOCAL INFILE file check could be satisfied by text inside q
CVE-2026-119281 5.9 MEDIUM MariaDB Connector/J: Server could switch character_set_results away from UTF-8 without the
CVE-2026-119279 5.9 MEDIUM MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated
CVE-2026-119277 5.9 MEDIUM MariaDB Connector/J: Rogue server can make the client read past the packet through server-
CVE-2026-119278 5.9 MEDIUM MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authen
CVE-2026-119280 3.7 LOW MariaDB Connector/J : XA recover() trusted server-supplied gtrid and bqual lengths

IV. Related Vulnerabilities

Same product: mariadb-connector-j
Same vendor: mariadb-corporation
Same weakness: CWE-130