---
id: "CVE-2026-101678"
kind: "vulnerability"
aliases: ["CVE-2026-101678"]
title: "MySQL Connector/J: unauthenticated network attacker can partially deny service"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["connector-j", "java", "jdbc", "mysql", "package"]
not_affected_if: ["version-other-than-26.7.0"]
published_at: "2026-10-20T22:18:22+00:00"
first_seen_at: "2026-10-23T21:57:22+00:00"
updated_at: "2026-10-25T04:39:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101678", "first_seen_at": "2026-10-23T21:57:22+00:00"}]
---

# MySQL Connector/J: unauthenticated network attacker can partially deny service

MySQL Connector/J, Oracle's Java JDBC driver for MySQL, has a flaw that an unauthenticated network attacker can trigger to cause a partial denial of service. The attack needs a person other than the attacker to interact with the connection, and it affects availability only, with no data exposure reported.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Connector/J version in the application's dependencies, for example `mvn dependency:tree | grep mysql-connector` or the `mysql-connector-j` entry in the build file
- unknown for other checks; the sources do not list a detection command

## Fix

- Move Connector/J to a release newer than `26.7.0`; the sources do not name the exact fixed version
- unknown for other actions; the sources do not describe a configuration workaround

## Timeline

- 2026-10-23T21:57:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-101678

## From the sources

Vulnerability in the MySQL Connectors product of Oracle MySQL (component: Connector/J).   The supported version that is affected is 26.7.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Connectors.  Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of MySQL Connectors. CVSS 3.1 Base Score 4.3 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_