CVE-2026-91332
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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 Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 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. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE 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 5.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).

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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-2026-91332
EUVD
EUVD-2026-106586

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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's Networking component. It allows unauthenticated attackers with network access to potentially modify data in Oracle Java SE without needing special privileges. The attack is considered easy to exploit and can impact data integrity.

Detection Guidance

This vulnerability involves Oracle Java SE networking components. Detection requires checking installed Java versions against affected releases (8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, etc.). Use commands like 'java -version' to identify installed versions and compare against the list of vulnerable releases.

Impact Analysis

If you use affected versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition, an attacker could modify some data within the Java SE environment. This could lead to data corruption or unauthorized changes in applications relying on these components.

Compliance Impact

This vulnerability allows unauthorized modification of data, which could lead to violations of integrity requirements in GDPR and HIPAA. Unauthorized data changes may result in non-compliance with these regulations.

Mitigation Strategies

Update Oracle Java SE to the latest patched versions listed in the CVE description. Remove or restrict access to vulnerable Java deployments, especially those running untrusted code. Monitor network traffic for suspicious API usage targeting the affected component.

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