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CVE-2026-107819— MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure

Quick assessment

Affected
MariaDB server
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/C 是一个用于将应用程序连接到 MariaDB 和 MySQL 数据库的 C/C++ 客户端库。在版本 3.4.1 至 3.4.10 之间，MariaDB Connector/C 的 libmariadb 组件中零配置 SSL 认证切换逻辑存在缺陷：虽然会检查证书信任失败的情况，但在选择非哈希认证插件之前，未对 TLS 主机名验证不匹配的情况进行拒绝。因此，拥有其他主机名有效证书的活动中间人（MITM）攻击者可以请求使用 mysql_clear_password 认证方式，并在攻

CVSS 5.9 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1021.004 · SSH

Affected Version Matrix 1

VendorProduct Version RangeStatus
MariaDB server >= 3.4.1, < 3.4.10 affected
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I. Basic Information for CVE-2026-107819

Vulnerability Information
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Vulnerability Title
MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure
Source: CVE Program / CVE List V5
Vulnerability Description
MariaDB Connector/C is a C and C++ client library for connecting applications to MariaDB and MySQL databases. From 3.4.1 until 3.4.10, the MariaDB Connector/C libmariadb Zero-Configuration SSL authentication-switch logic checked certificate trust failure but did not reject a TLS hostname verification mismatch before selecting a non-hashing authentication plugin. An active man-in-the-middle attacker with a valid certificate for another hostname could request mysql_clear_password and obtain the database password inside the attacker-controlled TLS connection. Other MariaDB connectors are not affected. This issue is fixed in version 3.4.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MariaDB server >= 3.4.1, < 3.4.10 -

II. Public POCs for CVE-2026-107819

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III. Intelligence Information for CVE-2026-107819

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Patches & Fixes for CVE-2026-107819 (1)

Vendor Advisories for CVE-2026-107819 (2)

Vendor Pages for CVE-2026-107819 (1)

Same Patch Batch · MariaDB · 2026-10-09 · 9 CVEs total

CVE-2026-107815 8.5 HIGH MariaDB: one byte OOB write in DOS tables of the CONNECT engine
CVE-2026-107814 8.4 HIGH MariaDB: Insecure $HOME in MariaDB rpm packages
CVE-2026-107818 8.4 HIGH MariaDB: environment injection via wsrep bootstrap in the mariadb.service file
CVE-2026-107821 8.0 HIGH MariaDB: insufficient validation of binary frm data when opening a table
CVE-2026-107823 7.2 HIGH MariaDB: privilege escalation via incorrect view frm parsing
CVE-2026-107816 6.4 MEDIUM MariaDB: `qc_info` plugin can do OOB reads if query contains \0
CVE-2026-107822 6.4 MEDIUM MariaDB: database privilege escalation via user / role name collision in the acl cache
CVE-2026-107817 4.4 MEDIUM MariaDB: mysql_json plugin OOB reads

IV. Related Vulnerabilities

Same product: server
Same vendor: MariaDB
Same weakness: CWE-297

V. Comments for CVE-2026-107819

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