CVE-2026-91395

Received Received - Intake

Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: Oracle

Description

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Utility). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, 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 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 6.5 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-20

Generated

2026-10-21

AI Q&A

2026-10-21

EPSS Evaluated

N/A

NVD

CVE-2026-91395

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle	Corporation	Oracle Java SE 8u503
Oracle	Corporation	Oracle Java SE 8u503-perf
Oracle	Corporation	Oracle Java SE 11.0.32.1
Oracle	Corporation	Oracle GraalVM for JDK 17.0.20.1
Oracle	Corporation	Oracle GraalVM for JDK 21.0.12.1
Oracle	Corporation	Oracle GraalVM Enterprise Edition 21.3.19.1.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition. It allows an unauthenticated attacker with network access to exploit the Utility component, potentially leading to unauthorized data modification or partial denial of service.

Detection Guidance

This vulnerability affects specific versions of Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition. Detection involves checking installed versions against the affected releases: Java SE 8u503, 8u503-perf, 11.0.32.1; GraalVM for JDK 17.0.20.1 and 21.0.12.1; GraalVM Enterprise Edition 21.3.19.1.1. Use commands like 'java -version' or 'gu -version' to check versions.

Impact Analysis

An attacker could modify or delete data in affected Java applications or cause a partial denial of service. This is especially risky for Java deployments running untrusted code, such as web-based Java applications.

Mitigation Strategies

Apply the latest patches from Oracle to upgrade to non-vulnerable versions. If immediate patching is not possible, restrict network access to Java applications, disable unnecessary Java services, and monitor for unusual activity. Consider sandboxing Java applications to limit potential impact.

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