Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JGSS). 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. Difficult to exploit 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 ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition as well as unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. 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:H/PR:N/UI:N/S:U/C:N/I:L/A:H).
Published: 2026-10-20
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service and unauthorized data modification
Action: Immediate Patch
AI Analysis

Impact

An issue in Oracle’s JGSS component used by Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition allows an unauthenticated remote attacker with network reach to invoke exposed APIs. Successful exploitation may cause the targeted Java runtime to hang or repeatedly crash, resulting in a denial‑of‑service condition, and may also permit an attacker to perform unauthorized updates, inserts or deletions on data accessible to the affected runtime. The weakness stems from insufficient validation or security controls in the JGSS API layer.

Affected Systems

Affected vendors and products include Oracle Java SE, Oracle GraalVM Enterprise Edition, and Oracle GraalVM for JDK. Specifically, vulnerable releases are Oracle Java SE 8u503 and 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 21.3.19.1.1. No other versions are known to be affected.

Risk and Exploitability

The CVSS v3.1 base score of 6.5 indicates a medium‑high severity with high availability impact and low integrity impact. The EPSS score is < 1%, indicating a very low but non‑zero probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. The attack demands only network access to the vulnerable APIs, no credentials, and no user interaction, making remote exploitation a realistic risk for exposed instances of the affected products.

Generated by OpenCVE AI on October 23, 2026 at 21:56 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle security update that addresses the JGSS API vulnerability for the affected Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition releases.
  • If a patch is not yet available, limit inbound network traffic to the vulnerable APIs by configuring firewall rules that block the relevant ports and by disabling or protecting exposed services.
  • Implement monitoring of application logs and system behavior for signs of hangs, crashes, or unauthorized write activity, and enforce alert rules for anomalous events.

Generated by OpenCVE AI on October 23, 2026 at 21:56 UTC.

Tracking

Sign in to view the affected projects.

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

Fri, 23 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Fri, 23 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Thu, 22 Oct 2026 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-347
CWE-862

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

Type Values Removed Values Added
Title openjdk: Enhance JGSS (Oracle CPU 2026-10)
Weaknesses CWE-1286
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Oracle oracle Java Se
Weaknesses CWE-347
CWE-862
Vendors & Products Oracle oracle Java Se

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: JGSS). 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. Difficult to exploit 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 ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition as well as unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. 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:H/PR:N/UI:N/S:U/C:N/I:L/A:H).
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:H/PR:N/UI:N/S:U/C:N/I:L/A:H'}

Subscriptions

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

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-23T19:58:11.357Z

Reserved: 2026-09-14T22:10:16.633Z

Link: CVE-2026-91411

cve-icon Vulnrichment

Updated: 2026-10-23T19:57:31.723Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:44.483

Modified: 2026-10-23T20:17:29.437

Link: CVE-2026-91411

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:25:49Z

Links: CVE-2026-91411 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T22:00:28Z

Weaknesses
  • CWE-1286

    Improper Validation of Syntactic Correctness of Input

  • CWE-20

    Improper Input Validation