CVE-2026-91411
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Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-23

Assigner: Oracle

Description
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; 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 of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition as well as unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. 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:H/PR:N/UI:N/S:U/C:N/I:L/A:H).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-23
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91411
EUVD
EUVD-2026-106663

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This is a vulnerability in Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition affecting specific versions. It allows unauthenticated attackers to cause a denial of service (DOS) or unauthorized data manipulation via network access. The attack requires no user interaction and exploits weaknesses in the JGSS component.

Detection Guidance

Detection involves checking for affected Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition versions. Verify installed versions using commands like 'java -version' or 'gu --version' for GraalVM. Monitor for crashes or hangs in Java applications, especially those using JGSS APIs.

Impact Analysis

If exploited, this vulnerability could allow attackers to crash your Java applications repeatedly, making them unavailable. It may also let attackers modify some data within your Java environment, potentially leading to data corruption or unauthorized changes.

Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA due to unauthorized data modification and denial-of-service risks. The flaw allows unauthorized updates to data (integrity impact) and system crashes (availability impact), which could violate GDPR's data integrity requirements and HIPAA's availability and integrity safeguards for protected health information.

Mitigation Strategies

Update affected Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition versions to the latest patched releases immediately. Disable Java Web Start applications and sandboxed Java applets if not required. Restrict network access to Java services where possible.

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