CVE-2026-91375
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Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-21

Assigner: Oracle

Description
Vulnerability in Oracle Java SE (component: Libraries). 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 logon to the infrastructure where Oracle Java SE executes to compromise Oracle Java SE. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all 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 4.7 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/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-2026-91375
EUVD
EUVD-2026-106629

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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Executive Summary

This is a vulnerability in Oracle Java SE's Libraries component affecting multiple versions. It allows an unauthenticated attacker with local access to compromise Java SE by exploiting APIs, potentially leading to unauthorized data modification or deletion. Exploitation requires human interaction beyond the attacker.

Detection Guidance

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

For GraalVM, use 'gu --version' or check installation directories. If any affected version is found, apply the latest Oracle Java SE patches immediately.

Impact Analysis

If you use affected Oracle Java SE versions, an attacker with local access could modify or delete critical data through Java APIs. This is especially risky for systems running untrusted Java code like web apps or applets, as it bypasses sandbox protections.

Compliance Impact

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

Mitigation Strategies

Apply the latest Oracle Java SE security patches immediately to affected versions (8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, and related GraalVM versions). Disable Java Web Start applications and untrusted Java applets if not required. Restrict access to systems running vulnerable Java versions until patched.

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