# CVE-2026-101678: Oracle MySQL Connector/J denial of service

Source: https://junglewise.ai/threats/cve-2026-101678-vulnerability-in-the-mysql-connectors-product-of-oracle-mysql  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-101678 · Severity: medium · CVSS 4.3 · Published 2026-10-20

MySQL Connector/J is a database driver that connects Java applications to MySQL databases. An unauthenticated attacker can exploit this vulnerability over the network with user interaction to partially disrupt the connector's availability. This could affect Java applications relying on the connector to access their databases.

Technologies: [Oracle Mysql Connector\/J](https://junglewise.ai/threats/technologies/mysql-connector-j). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-101678 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101678 being exploited in the wild.

**How severe is CVE-2026-101678?** Medium severity, with a CVSS score of 4.3, published 20 October 2026.

**Which products and versions are affected?** Oracle Mysql Connector\/J 26.7.0.

**Is there a fix for CVE-2026-101678?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101678 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-101678?** Check whether you run Oracle Mysql Connector\/J at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A denial-of-service vulnerability in MySQL Connector/J allows an unauthenticated network attacker to cause partial unavailability via multiple protocols. The attack requires user interaction and results in reduced availability but no data confidentiality or integrity impact. The vulnerability is easily exploitable with low attack complexity.

## Affected products

- Oracle MySQL Connector/J 26.7.0

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle MySQL Connector/J remote code execution](https://junglewise.ai/threats/cve-2026-101768-vulnerability-in-the-mysql-connectors-product-of-oracle-mysql)
- [Oracle MySQL Connector/J data integrity compromise via network](https://junglewise.ai/threats/cve-2026-101677-vulnerability-in-the-mysql-connectors-product-of-oracle-mysql)