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CVE-2026-119279— MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths

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 Java 开发的应用程序连接到 MariaDB 和 MySQL 数据库的驱动组件。在 3.0.0 至 3.3.7、3.4.5 和 3.5.10 版本中， 和 方法将协议中的无符号 8 字节长度编码整数直接转换为 Java 类型，而未验证该值是否落在非负整数范围内。当数值超过 时，会发生回绕，导致负数或无关的长度值被下游的内存分配与读取路径使用。恶意或已被攻陷的服务器，或实施中间人攻击的攻击者，可利用此问题在客户端连接处理过程中触发 、越界访问失败，或引发超大内存分配

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-119279

Vulnerability Information
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Vulnerability Title
MariaDB Connector/J: Length-encoded integers larger than Integer.MAX_VALUE were truncated before being used as lengths
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 3.5.10, the ReadableByteBuf.readLength() and ReadableByteBuf.readIntLengthEncodedNotNull() methods narrowed the protocol's unsigned 8-byte length-encoded integer to a Java int without checking that the value fit a non-negative integer. Values above Integer.MAX_VALUE could wrap to a negative or unrelated length that downstream allocation and read paths used. A malicious or compromised server, or a machine-in-the-middle attacker, could trigger NegativeArraySizeException, out-of-bounds failures, or oversized allocation behavior in client connection handling. This issue is fixed in versions 3.3.7, 3.4.5, and 3.5.10.
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-2026-119279

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III. Intelligence Information for CVE-2026-119279

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Other References for CVE-2026-119279 (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-2026-119276 5.9 MEDIUM MariaDB Connector/J: Rogue server can drive large heap allocations from server-declared le
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