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).
Published: 2026-10-20
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized data modification and partial denial of service
Action: Patch
AI Analysis

Impact

This vulnerability in Oracle Java SE, Oracle GraalVM for JDK and Oracle GraalVM Enterprise Edition’s Utility component allows an unauthenticated attacker with network access to exploit APIs and obtain unchecked update, insert or delete capabilities on accessible data. The attack also enables causing a partial denial of service. The CVSS 3.1 base score of 6.5 reflects that the confidentiality is unaffected while the integrity and availability are low‑level compromised.

Affected Systems

Affected vendors are Oracle Corporation. The products impacted are Oracle Java SE (versions 8u503, 8u503‑perf, 11.0.32.1), Oracle GraalVM for JDK (versions 17.0.20.1 and 21.0.12.1) and Oracle GraalVM Enterprise Edition (version 21.3.19.1.1). These versions are vulnerable when the Utility component is exposed via the listed protocols.

Risk and Exploitability

The CVSS score of 6.5 denotes moderate severity with Integrity and Availability impacts. The EPSS score of 0.00267 indicates a very low but non‑zero exploitation probability of less than 1%, and the vulnerability is not listed in CISA’s KEV catalog. The likely attack vector is network based, accessing the vulnerable APIs through multiple protocols; an attacker does not need prior authentication. Successful exploitation requires only that the vulnerable component is exposed, with no additional privileges or complex setup. The resulting compromise allows unauthorized data manipulation and can generate a partial denial of service, potentially affecting individual applications or broader services that rely on the affected Java or GraalVM instances.

Generated by OpenCVE AI on October 23, 2026 at 04:42 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle security patch that addresses Oracle Java SE 8u503, 8u503‑perf, 11.0.32.1, GraalVM for JDK 17.0.20.1 and 21.0.12.1, and GraalVM Enterprise Edition 21.3.19.1.1
  • Configure firewalls or network segmentation to restrict external access to the vulnerable APIs, ensuring only trusted internal hosts can reach them
  • Disable or remove Oracle Java Web Start applications and sandboxed Java applets that may load untrusted code if they are not required for business operations

Generated by OpenCVE AI on October 23, 2026 at 04:42 UTC.

Tracking

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Advisories

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History

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Oracle graalvm Enterprise Edition
Oracle oracle Java Se
Weaknesses CWE-284
Vendors & Products Oracle graalvm Enterprise Edition
Oracle oracle Java Se
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 22 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Title Unauthenticated API Access Allows Unauthorized Data Modification and Partial Denial of Service in Oracle Java and GraalVM openjdk: Enhance Pack200 unpacking (Oracle CPU 2026-10)
Weaknesses CWE-22
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 09:30:00 +0000

Type Values Removed Values Added
Title Unauthenticated API Access Allows Unauthorized Data Modification and Partial Denial of Service in Oracle Java and GraalVM
Weaknesses CWE-269
CWE-285

Tue, 20 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
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).
First Time appeared Oracle
Oracle graalvm
Oracle graalvm For Jdk
Oracle java Se
CPEs cpe:2.3:a:oracle:graalvm:21.3.19.1.1:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:graalvm_for_jdk:17.0.20.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:graalvm_for_jdk:21.0.12.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:11.0.32.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:8u503:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:8u503:*:*:*:enterprise_performance:*:*:*
Vendors & Products Oracle
Oracle graalvm
Oracle graalvm For Jdk
Oracle java Se
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'}

Subscriptions

Oracle Graalvm Graalvm Enterprise Edition Graalvm For Jdk Java Se Oracle Java Se
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-22T18:50:24.928Z

Reserved: 2026-09-14T22:10:16.632Z

Link: CVE-2026-91395

cve-icon Vulnrichment

Updated: 2026-10-22T18:46:56.626Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:42.843

Modified: 2026-10-22T19:18:04.623

Link: CVE-2026-91395

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:25:44Z

Links: CVE-2026-91395 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T04:45:14Z

Weaknesses
  • CWE-22

    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

  • CWE-269

    Improper Privilege Management

  • CWE-284

    Improper Access Control

  • CWE-285

    Improper Authorization