Live › vulnerability › CVE-2026-91464
Go to dashboardA flaw in the JGSS component of Oracle Java SE and GraalVM lets a remote attacker reach confidential data when a user runs untrusted code. Oracle rates it medium (CVSS 5.3) and says it matters mainly for sandboxed Java Web Start or applet deployments.
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.
Oracle says the flaw applies to client-side Java deployments, typically sandboxed Java Web Start applications or applets, that run untrusted code and rely on the Java sandbox. Server deployments that run only trusted, administrator-installed code are not in scope according to the advisory text.
No product ranges from the sources yet.
java -version to see the installed Java SE build and compare it with the affected versions listed in the advisory.8u503 or later, Java 11 to 11.0.32.1 or later, Java 17 to 17.0.20.1 or later, Java 21 to 21.0.12.1 or later, and Java 25 to 25.0.4.1 or later, per Oracle's patch list.17.0.20.1 or later and 21 to 21.0.12.1 or later, and GraalVM Enterprise to 21.3.19.1.1 or later.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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