CVE-2026-91400
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Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-29

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Sound). 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 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 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 3.1 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-29
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-09
NVD
CVE-2026-91400
EUVD
EUVD-2026-106654

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This is a vulnerability in Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition affecting multiple versions. It allows an unauthenticated attacker to cause a partial denial of service through network access. Exploitation requires human interaction and only impacts Java deployments running untrusted code in sandboxed environments like Java Web Start or applets.

Detection Guidance

This vulnerability affects Java deployments running untrusted code in sandboxed environments like Java Web Start or applets. Detection involves checking installed Java versions against affected releases (8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, etc.). Use commands like 'java -version' to verify versions. Monitor network traffic for suspicious interactions with Java components.

Impact Analysis

If you use affected Java versions in sandboxed environments (e.g., Java Web Start or applets), an attacker could disrupt service availability. This does not affect server deployments running trusted code. The impact is limited to partial denial of service.

Compliance Impact

This vulnerability causes a partial denial of service in affected Java deployments, which may impact system availability. For GDPR, availability is a key aspect of data integrity and security. For HIPAA, system availability is critical for maintaining access to protected health information. However, the vulnerability does not directly lead to unauthorized data access or disclosure.

Mitigation Strategies

Upgrade to the latest non-vulnerable versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition. Remove or disable Java Web Start and applet support if unused. Restrict network access to Java applications. Apply patches from Oracle immediately.

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