Live › vulnerability › CVE-2026-91463
Go to dashboardA flaw in the JGSS component of Oracle Java SE and GraalVM lets an unauthenticated remote attacker reach data the runtime can access. Exploitation is hard and needs a victim to take an action, and the Oracle note says the risk is mainly for clients running untrusted Java Web Start or applet code.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
The sources say the issue applies to Java deployments that run untrusted code and rely on the Java sandbox, such as sandboxed Java Web Start applications or applets on client machines. The sources say it does not apply to server deployments that run only trusted code installed by an administrator.
No product ranges from the sources yet.
java -version and compare the build with the affected versions listed in the sources (8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27).17.0.20.1, 21.0.12.1 or 21.3.19.1.1.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JGSS). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Difficult to exploit 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 require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability 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. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).
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