CVE-2026-91385
Received Received - Intake

Memory Corruption in Oracle JavaFX

Publication date: 2026-10-20

Last updated on: 2026-10-21

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle JavaFX, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JavaFX). Supported versions that are affected are Oracle Java SE: 8u503; Oracle JavaFX: 21.0.12, 25.0.4 and 27; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle JavaFX, 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 update, insert or delete access to some of Oracle Java SE, Oracle JavaFX, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle JavaFX, 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 5.4 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-2026-91385
EUVD
EUVD-2026-106639

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This is a vulnerability in Oracle Java SE, JavaFX, and GraalVM Enterprise Edition that allows an unauthenticated attacker to remotely access and modify some data within these products. It requires user interaction to exploit and affects client-side Java deployments running untrusted code.

Detection Guidance

Detection requires checking installed Java versions and JavaFX components. Verify if Oracle Java SE 8u503, JavaFX 21.0.12/25.0.4/27, or GraalVM Enterprise Edition 21.3.19.1.1 are present. Use commands like 'java -version', 'where java' (Windows), or 'which java' (Linux/macOS) to locate Java installations. Check JavaFX by inspecting application dependencies or running 'javafx --version' if supported.

Impact Analysis

If you use affected versions of Oracle Java SE, JavaFX, or GraalVM in client applications that run untrusted code, an attacker could read or alter some of your data. Servers running only trusted code are not affected.

Compliance Impact

This vulnerability allows unauthorized read and limited write access to data in affected Java deployments. For GDPR, this could lead to unauthorized data access, potentially violating principles of data protection and user consent. For HIPAA, it may compromise protected health information integrity and confidentiality if exploited in healthcare environments.

Mitigation Strategies

Update affected Oracle Java SE, JavaFX, or GraalVM Enterprise Edition to the latest patched versions immediately. Disable Java Web Start applications and sandboxed Java applets if not required. Restrict network access to Java applications and monitor for unauthorized data access attempts.

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