CVE-2026-107382 in Connector Node.js
Summary
by MITRE • 10/08/2026
MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. From 3.3.0 until 3.5.4, the zero-configuration TLS fingerprint-validation path calls Ed25519PasswordAuth.hash() through Authentication.validateFingerPrint, but Ed25519PasswordAuth.hash() references a seed identifier that is not in scope. Exposure requires a MariaDB server reached over TCP, TLS enabled with ssl: true or an ssl object whose rejectUnauthorized value is not false, a password set, no ssl.ca configured, and client_ed25519 negotiated as the authentication plugin. Under those conditions, a legitimate server, malicious server, or network attacker presenting a self-signed certificate can reach this path and cause a synchronous ReferenceError to escape the socket data handler. Under Node.js default uncaught-exception behavior, the client process terminates, causing denial of service. Configurations using a provided CA, rejectUnauthorized: false, another authentication plugin, or a Unix socket do not reach this vulnerable path. This issue is fixed in version 3.5.4.
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Analysis
by VulDB Data Team • 10/08/2026
MariaDB Connector/Node.js serves as the critical bridge allowing Node.js applications to communicate with MariaDB and MySQL database servers. In versions ranging from 3.3.0 through 3.5.4, a specific vulnerability exists within the zero-configuration TLS fingerprint-validation mechanism. This flaw arises during the authentication handshake process when the connector attempts to validate the server's identity using Ed25519 public key cryptography. The core technical defect lies in the implementation of the Ed25519PasswordAuth.hash function, which is invoked via Authentication.validateFingerPrint. Specifically, this hash function references a seed identifier that falls outside its intended scope or context. This architectural oversight means that under certain configuration conditions, the code attempts to access data structures or variables that are not properly initialized or available within the current execution frame, leading directly to a runtime failure rather than a secure cryptographic validation.
The operational impact of this vulnerability is primarily a denial of service against the client application running on Node.js. For an attacker to exploit this flaw, several specific conditions must align simultaneously. The connection must be established over TCP with TLS enabled, either by setting ssl: true or providing an SSL object where rejectUnauthorized is not set to false. Additionally, no CA certificate should be configured in the SSL options, and the client_ed25519 authentication plugin must be negotiated for use during the handshake. Under these circumstances, if a legitimate server with a self-signed certificate, a malicious server, or even a network attacker performing a man-in-the-middle attack presents their certificate, the connector will attempt to validate the fingerprint using the flawed Ed25519 logic. This triggers a synchronous ReferenceError that escapes the socket data handler. Because Node.js defaults to terminating the process upon uncaught exceptions, this error causes the entire client application to crash immediately, resulting in a complete denial of service for any users relying on that specific database connection instance.
This vulnerability is classified under CWE-248, which describes Unhandled Exception at Program End, as well as CWE-915, Improper Extension of Modifier, due to the scope issue with the seed identifier. In terms of the MITRE ATT&CK framework, this aligns with T1499 Endpoint Denial of Service, specifically reflecting techniques that exploit software vulnerabilities to disrupt service availability rather than compromising confidentiality or integrity directly. The attack vector is considered remote if an attacker can intercept traffic between the client and server, but it requires specific configuration weaknesses on the client side, such as disabling strict certificate verification by omitting CA certificates while still relying on TLS for transport security without proper fallback mechanisms.
Mitigation strategies focus heavily on upgrading to version 3.5.4 or later of MariaDB Connector/Node.js, where this scope error has been corrected and the hash function properly handles its inputs. For environments that cannot immediately upgrade, administrators should ensure that ssl.ca is configured with a trusted Certificate Authority bundle, which bypasses the zero-configuration fingerprint validation path entirely. Alternatively, setting rejectUnauthorized to false in the SSL configuration object will also prevent execution of this vulnerable code path, although doing so reduces overall TLS security by accepting any certificate without verification. It is crucial to note that connections using Unix sockets or those negotiating authentication plugins other than client_ed25519 are not susceptible to this specific flaw and do not require these mitigations for this particular issue.