CVE-2026-91381
Received Received - Intake

Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-21

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: 2D). Supported versions that are affected are Oracle Java SE: 8u503 and 8u503-perf; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM Enterprise Edition 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 3.7 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-21
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91381
EUVD
EUVD-2026-106635

Affected Vendors & Products

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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 and Oracle GraalVM Enterprise Edition affecting versions 8u503 and 21.3.19.1.1. It allows an unauthenticated attacker with network access to potentially modify data in the affected products through APIs or web services. The attack is difficult to exploit and primarily impacts data integrity.

Detection Guidance

This vulnerability affects Oracle Java SE and GraalVM Enterprise Edition versions 8u503 and 21.3.19.1.1. Detection involves checking installed Java versions and applying Oracle's security patches. Use commands like 'java -version' to identify installed versions and compare them against the affected releases.

Impact Analysis

If exploited, this vulnerability could allow an attacker to modify data in Oracle Java SE or GraalVM without authorization. This is especially risky for systems running untrusted Java code, such as web-based applications or applets, as it could lead to data corruption or unauthorized changes.

Compliance Impact

This vulnerability allows unauthorized modification of data, which could lead to integrity issues. For GDPR, this may impact data accuracy requirements under Article 5. For HIPAA, it could affect the integrity of protected health information. However, the specific compliance impact depends on system configuration and data handling practices.

Mitigation Strategies

Update affected Oracle Java SE and GraalVM Enterprise Edition versions to the latest patched releases immediately. Disable Java Web Start applications and applets if they are not required. Restrict network access to Java components where possible.

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