CVE-2026-83400
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XML External Entity Processing 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 GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JAXP). 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. 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).

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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-2026-83400
EUVD
EUVD-2026-106318

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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, GraalVM for JDK, and GraalVM Enterprise Edition affecting multiple versions. It allows unauthenticated attackers with network access to cause a partial denial of service (DOS) by exploiting the JAXP component. The attack can be carried out via multiple protocols and does not require user interaction.

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. Use commands like 'java -version' or 'gu --version' to check versions. Monitor network traffic for unusual activity targeting JAXP APIs.

Impact Analysis

The vulnerability can lead to partial service disruptions for applications running on affected Java versions. Systems relying on these versions may experience reduced availability or performance issues. Users of Java Web Start or applets loading untrusted code are also at risk.

Compliance Impact

This vulnerability causes partial denial of service in Java SE components, which may impact system availability. For GDPR, availability issues could affect data processing operations requiring uninterrupted service. HIPAA requires safeguards for data availability, so partial DOS may introduce compliance risks if critical systems are affected.

Mitigation Strategies

Apply the latest patches from Oracle to upgrade to non-vulnerable versions. If patching is not immediately possible, restrict network access to Java applications using firewalls or disable JAXP APIs if not required. Monitor Oracle's security advisories for updates.

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