CVE-2026-91487
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Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-24

Assigner: Oracle

Description
Vulnerability in Oracle Java SE (component: Compiler). 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. Difficult to exploit 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 as well as unauthorized read access to a subset of Oracle Java SE accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-24
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91487
EUVD
EUVD-2026-106732

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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 Compiler component affecting multiple versions. It allows unauthenticated attackers with network access to potentially read or modify some data within Oracle Java SE through various protocols. The attack requires supplying data to specific APIs without using Untrusted Java Web Start or applets, such as via a web service.

Detection Guidance

This vulnerability is specific to Oracle Java SE and GraalVM components. Detection involves checking installed Java versions against affected releases. Use commands like 'java -version' or 'where java' to identify installed versions. Compare these against the list of affected versions: 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, 17.0.20.1 (GraalVM), and 21.0.12.1 (GraalVM).

Impact Analysis

If exploited, this vulnerability could allow attackers to read or modify some data in Oracle Java SE without authentication. This may lead to unauthorized access to sensitive information or unintended changes to data, depending on the application's use of the affected Java versions.

Compliance Impact

This vulnerability allows unauthorized read and limited write access to Oracle Java SE data, which could lead to exposure of sensitive information. This may impact compliance with GDPR (data confidentiality requirements) and HIPAA (protected health information safeguards) if exploited.

Mitigation Strategies

Apply the latest Oracle Java SE or GraalVM patches immediately. Remove or disable any affected versions if patching is not possible. Restrict network access to Java APIs where possible. Monitor for unusual data access patterns or unauthorized modifications.

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