Oracle Java SE/GraalVM for JDK/GraalVM Enterprise Edition JGSS sandbox

Summaryinfo

A vulnerability described as problematic has been identified in Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition. Affected by this vulnerability is an unknown functionality of the component JGSS. Such manipulation leads to sandbox. This vulnerability is documented as CVE-2026-91464. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition (unknown version). Affected by this issue is an unknown code block of the component JGSS. The manipulation with an unknown input leads to a sandbox vulnerability. Using CWE to declare the problem leads to CWE-265. Impacted is confidentiality. CVE summarizes:

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).

The advisory is available at oracle.com. This vulnerability is handled as CVE-2026-91464 since 09/15/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/21/2026). This vulnerability is assigned to T1611 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• Oracle

Name

• GraalVM Enterprise Edition
• GraalVM for JDK
• Java SE

License

• open-source

Website

• Vendor: https://www.oracle.com

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