CVE-2026-91397
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Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-23

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Serviceability). 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 unauthenticated attacker with logon to the infrastructure where Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition executes 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 update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. 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 3.6 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-23
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-09
NVD
CVE-2026-91397
EUVD
EUVD-2026-106651

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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, GraalVM for JDK, and GraalVM Enterprise Edition affecting multiple versions. It allows an unauthenticated attacker with local access to compromise the system through the Serviceability component. Exploitation requires human interaction and can lead to unauthorized data modification or partial denial of service.

Detection Guidance

This vulnerability is difficult to exploit and requires human interaction beyond the attacker. Detection may involve monitoring for unusual API usage or unauthorized data modifications in Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition. Check logs for suspicious activity in the Serviceability component. No specific commands are provided in the context.

Impact Analysis

An attacker could modify or delete some data in the affected Java environments or cause a partial disruption of services. This is possible even in sandboxed environments like Java Web Start or applets if they run untrusted code.

Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA due to unauthorized data modification and partial denial of service risks. Unauthorized updates or deletions of data could violate GDPR's integrity requirements or HIPAA's integrity and availability safeguards. The partial DOS could also affect system availability, potentially breaching compliance timelines or access controls.

Mitigation Strategies

Apply the latest security patches from Oracle for affected versions of Java SE, GraalVM for JDK, and GraalVM Enterprise Edition. Disable unnecessary APIs in the Serviceability component. Restrict access to systems running these products to reduce attack surface. Monitor for unauthorized data changes or partial denial of service conditions.

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