CVE-2026-91396 Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Utility).
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-91396?
CVE-2026-91396 is a medium-severity vulnerability in Oracle GraalVM Enterprise Edition, published on 20 Oct 2026.
Official description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Utility). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 6.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).
Weakness: CWE-284
Which versions are affected by CVE-2026-91396?
How do I fix CVE-2026-91396?
No fix has been published for CVE-2026-91396 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-91396 being exploited?
There is no known exploitation of CVE-2026-91396 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91396, GHSA-4hrr-844c-vx6m, UBUNTU-CVE-2026-91396.