CVE-2026-21975 Denial of service in Oracle Database Server

Medium 4.5 Published 20 Jan 2026 Updated 21 Jan 2026

A high-privileged attacker can cause a complete denial of service in the Java VM component of Oracle Database Server via network access.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-21975?

CVE-2026-21975 is a medium-severity denial of service vulnerability in Oracle Database Server, published on 20 Jan 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

Vulnerability in the Java VM component of Oracle Database Server. Supported versions that are affected are 19.3-19.29 and 21.3-21.20. Easily exploitable vulnerability allows high privileged attacker having Authenticated User privilege with network access via Oracle Net to compromise Java VM. 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 hang or frequently repeatable crash (complete DOS) of Java VM. CVSS 3.1 Base Score 4.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H).

Weakness: CWE-404

Which versions are affected by CVE-2026-21975?

It affects 1 product.

Products include Oracle Java Virtual Machine.

How do I fix CVE-2026-21975?

No fix has been published for CVE-2026-21975 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-21975 being exploited?

There is no known exploitation of CVE-2026-21975 in the wild and no public exploit code.

Sources

Also known as GHSA-wwp8-q895-jwf7.