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CVE-2026-119278— MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication

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 是用于将用 Java 开发的应用程序连接到 MariaDB 和 MySQL 数据库的驱动程序。在 3.0.0 至 3.3.7 以及 3.4.5 版本中，当使用 caching_sha2_password 身份验证机制时，驱动程序将"authentication-more-data"响应错误地当作长度编码的字节数组处理：它根据服务器声明的长度分配内存，并在未确认字节是否存在的情况下直接访问了 authResult[0]。恶意或已被攻陷的服务器，或实施中间人攻击的攻击者，可声明一

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-119278

Vulnerability Information
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Vulnerability Title
MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication
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 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.
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
对数组索引的验证不恰当
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-2026-119278

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III. Intelligence Information for CVE-2026-119278

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Other References for CVE-2026-119278 (5)

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-2026-119276 5.9 MEDIUM MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared le
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-2026-119280 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-129