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).
Published: 2026-10-20
Score: 3.6 Low
EPSS: < 1% Very Low
KEV: No
Impact: Data modification and partial denial of service
Action: Apply patch
AI Analysis

Impact

An unauthenticated attacker who can log on to the same infrastructure that hosts Oracle Java SE, Oracle GraalVM for JDK, or Oracle GraalVM Enterprise Edition can exploit the Serviceability component to execute API calls. The weakness involves improper access control (CWE-284) and imprecise resource handling (CWE-488), allowing the attacker to update, insert, or delete accessible data and to cause a partial denial of service in the affected products. The vulnerability does not grant full remote code execution but can compromise data integrity and availability for applications relying on the Java sandbox.

Affected Systems

Oracle Java SE versions 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, and 27 are affected, as well as Oracle GraalVM for JDK versions 17.0.20.1 and 21.0.12.1 and Oracle GraalVM Enterprise Edition 21.3.19.1.1.

Risk and Exploitability

The CVSS score of 3.6 reflects a low overall severity, and the EPSS score is < 1%, indicating a very low exploitation probability. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires the attacker to already have credentials with access to the host environment and a human operator to trigger the vulnerable API calls, which lowers the likelihood of widespread attacks. The primary attack vector is likely local or adjacent network access to the application servers that run the affected Java products.

Generated by OpenCVE AI on October 23, 2026 at 06:13 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the vendor’s security update for all affected Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition versions.
  • Restrict network access to the Serviceability APIs by enforcing firewall rules or ACLs so that only trusted hosts can invoke these services.
  • Monitor application logs for abnormal API usage patterns and enforce multi‑factor authentication for users who can deploy or run applications that use the vulnerable Java components.

Generated by OpenCVE AI on October 23, 2026 at 06:13 UTC.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4861-1 openjdk-17 security update
History

Fri, 23 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 22 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Oracle graalvm Enterprise Edition
Oracle oracle Java Se
Vendors & Products Oracle graalvm Enterprise Edition
Oracle oracle Java Se

Thu, 22 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284

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

Type Values Removed Values Added
Title Unauthenticated API Exploit in Oracle Java SE and GraalVM Leading to Data Modification and Partial Denial of Service openjdk: Enhance diagnostic sessions (Oracle CPU 2026-10)
Weaknesses CWE-488
References
Metrics threat_severity

None

 threat_severity

Low

Wed, 21 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
Title Unauthenticated API Exploit in Oracle Java SE and GraalVM Leading to Data Modification and Partial Denial of Service
Weaknesses CWE-284

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: 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).
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:17.0.20.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:21.0.12.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:25.0.4.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:27:*:*:*:*:*:*:*
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': 3.6, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/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: 2026-10-23T02:22:58.079Z

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

Link: CVE-2026-91397

cve-icon Vulnrichment

Updated: 2026-10-23T02:22:48.595Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:43.083

Modified: 2026-10-23T03:16:31.653

Link: CVE-2026-91397

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-20T21:25:45Z

Links: CVE-2026-91397 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T06:15:13Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-488

    Exposure of Data Element to Wrong Session