CVE-2026-91374
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Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-21

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Serviceability). 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 of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset 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 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-21
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91374
EUVD
EUVD-2026-106628

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

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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 with network access to potentially read or modify some data in these products through multiple protocols. The attack requires exploiting APIs in the Serviceability component, including in Java Web Start or applet deployments that rely on the Java sandbox.

Detection Guidance

This vulnerability affects Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition. Detection involves checking installed versions of these products against the affected versions listed in the CVE. No specific commands are provided in the context to directly detect exploitation, but you can verify installed versions using commands like 'java -version' or checking package managers for Java-related packages.

Impact Analysis

If you use affected versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition, an attacker could read or modify some of your data stored in these systems. This is especially risky if you run untrusted Java code from the internet in sandboxed environments like Java Web Start or applets.

Compliance Impact

This vulnerability allows unauthorized read and limited write access to data in affected Java environments. For GDPR, this could impact data confidentiality and integrity, potentially violating principles of data protection and user rights. For HIPAA, unauthorized access to sensitive health data could lead to compliance violations and breaches of protected health information.

Mitigation Strategies

Apply the latest security patches from Oracle for affected Java SE, GraalVM for JDK, and GraalVM Enterprise Edition versions. Update to versions 8u503-perf+, 11.0.32.2+, 17.0.20.2+, 21.0.12.2+, 25.0.4.2+, or 27+ as applicable. Disable unnecessary Java services and restrict network access to Java applications.

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