CVE-2026-47021

Analyzed Analyzed - Analysis Complete

Denial of Service in Oracle Java SE

Publication date: 2026-07-21

Last updated on: 2026-07-31

Assigner: Oracle

Description

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: 2D). Supported versions that are affected are Oracle Java SE: 8u491, 8u491-perf, 11.0.31, 17.0.19, 21.0.11, 25.0.3, 26.0.1; Oracle GraalVM for JDK: 17.0.19 and 21.0.11; Oracle GraalVM Enterprise Edition: 21.3.18. Easily exploitable 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 partial denial of service (partial DOS) of Oracle Java SE, 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).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-21

Last Modified

2026-07-31

Generated

2026-08-11

AI Q&A

2026-07-22

EPSS Evaluated

2026-08-09

NVD

CVE-2026-47021

EUVD

EUVD-2026-46509

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	jre	1.8.0
oracle	jre	11.0.31
oracle	jre	17.0.19
oracle	jre	21.0.11
oracle	jre	25.0.3
oracle	jre	26.0.1
oracle	jre	1.8.0
oracle	jdk	1.8.0
oracle	jdk	11.0.31
oracle	jdk	17.0.19
oracle	jdk	21.0.11
oracle	jdk	25.0.3
oracle	jdk	26.0.1
oracle	jdk	1.8.0
oracle	graalvm	21.3.18
oracle	graalvm_for_jdk	17.0.19
oracle	graalvm_for_jdk	21.0.11

Helpful Resources

Exploitability

CWE

KEV

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

Attack-Flow Graph

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 by exploiting the 2D component through network access via multiple protocols. The attack does not require user interaction and targets the availability of the system.

Detection Guidance

Detection involves checking installed Java versions and applying Oracle's security patches. Use commands like 'java -version' to identify installed versions and compare against affected releases. Monitor Oracle's security advisories for updates.

Impact Analysis

The vulnerability can lead to partial denial of service, meaning affected systems may experience reduced performance or availability. This could disrupt applications relying on Java, especially those running in sandboxed environments like Java Web Start or applets.

Compliance Impact

This vulnerability causes partial denial of service in affected Java components, which may disrupt availability of systems processing sensitive data. For GDPR, this could impact data availability requirements under Article 32. For HIPAA, it may affect access to protected health information during outages. However, the provided CVE details do not specify direct compliance impacts.

Mitigation Strategies

Update affected Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition installations to the latest patched versions 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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