CVE-2026-91418
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Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-22

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle JavaFX, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: ImageIO). 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 JavaFX: 21.0.12, 25.0.4, 27; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; 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 for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle JavaFX, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. 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 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-22
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91418
EUVD
EUVD-2026-106669

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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, JavaFX, GraalVM for JDK, and GraalVM Enterprise Edition affecting multiple versions. It allows unauthenticated attackers to cause a partial denial of service by exploiting the ImageIO component through network access.

Detection Guidance

Detection involves checking installed Java versions and verifying if they fall within the affected range. Use commands like 'java -version' to check the version. Monitor network traffic for unusual activity targeting Java ImageIO APIs.

Impact Analysis

The vulnerability can lead to partial denial of service in affected Java applications. This may disrupt services relying on these components, especially in environments running untrusted code like web services or Java Web Start applications.

Compliance Impact

This vulnerability causes a partial denial of service (DOS) in affected Java components, which could disrupt services handling sensitive data. For GDPR, this may impact availability of personal data processing systems. For HIPAA, it could affect the integrity and availability of protected health information systems. However, the vulnerability does not directly lead to data breaches or unauthorized access to data.

Mitigation Strategies

Apply the latest Oracle Java SE, JavaFX, GraalVM patches 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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