CVE-2026-91335
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Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-28

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: AWT). 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. Difficult to exploit vulnerability allows low privileged attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability 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. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 2.6 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-28
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91335
EUVD
EUVD-2026-106589

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-250 The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.

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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 involves the AWT component and allows low-privileged attackers with network access to potentially read a subset of accessible data. Exploitation requires human interaction from someone other than the attacker.

Detection Guidance

Detection involves checking installed Java versions and verifying if they fall within affected ranges. Use commands like 'java -version' or 'where java' to identify installed versions. Compare against affected versions: 8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27 for Oracle Java SE.

Impact Analysis

The impact is limited to unauthorized read access to a subset of data in affected Java deployments. It primarily affects client-side applications running untrusted code in sandboxed environments like Java Web Start or applets. Server-side deployments running trusted code are not vulnerable.

Compliance Impact

This vulnerability allows unauthorized read access to a subset of data in affected Java deployments. For GDPR, this could impact confidentiality requirements if personal data is exposed. For HIPAA, it may violate safeguards for protected health information if such data is accessible. The low impact score suggests limited risk but still requires mitigation in environments handling sensitive data.

Mitigation Strategies

Apply the latest security patches from Oracle to update affected Java versions. If patching is not immediately possible, consider disabling Java Web Start applications or sandboxed Java applets that load untrusted code. Restrict network access to Java applications where possible.

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