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, 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 network access via multiple protocols 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 access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability 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. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).
Published: 2026-10-20
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized access to critical data
Action: Assess Impact
AI Analysis

Impact

The JGSS component of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition contains a vulnerability that exposes an unauthenticated attacker with network access to potentially compromise the Java runtime. The flaw requires interactions from a user other than the attacker to succeed, meaning the attacker must rely on a separate person to trigger the vulnerability. When exploited, the attacker can obtain unauthorized access to critical data or complete control over all data processed by the Java platform in affected client environments such as Web Start applications or sandboxed applets.

Affected Systems

Affected vendors include Oracle GraalVM Enterprise Edition, Oracle GraalVM for JDK, and Oracle Java SE. Vulnerable versions are Oracle Java SE 8u503, 8u503‑perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, and 27; Oracle GraalVM for JDK 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition 21.3.19.1.1.

Risk and Exploitability

The CVSS base score of 5.3 indicates moderate severity with a focus on confidentiality. The EPSS score of < 1% suggests a low probability of exploitation. This vulnerability is not listed in the CISA KEV catalog. The attack vector, as described, is an unauthenticated network attack via multiple protocols. Due to the requirement for a separate human interaction to trigger the flaw, immediate risk is limited, but environments that load untrusted client code remain at risk.

Generated by OpenCVE AI on October 24, 2026 at 04:20 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the official Oracle patch for CVE‑2026‑91464 as detailed in the Oracle security advisory
  • Upgrade to the latest supported versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition that include the fix
  • Disable or restrict Java Web Start applications and sandboxed applets that load untrusted code, or remove unnecessary networking protocols from the Java runtime environment

Generated by OpenCVE AI on October 24, 2026 at 04:20 UTC.

Tracking

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

Sat, 24 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics ssvc

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

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

Type Values Removed Values Added
Weaknesses CWE-269
CWE-640

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

Type Values Removed Values Added
Title Unauthenticated Network Exploit in Oracle Java SE and GraalVM JGSS Requires Human Interaction openjdk: Enhance Kerberos validation (Oracle CPU 2026-10)
Weaknesses CWE-303
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 18:15:00 +0000

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

Wed, 21 Oct 2026 13:15:00 +0000

Type Values Removed Values Added
Title Unauthenticated Network Exploit in Oracle Java SE and GraalVM JGSS Requires Human Interaction
Weaknesses CWE-269
CWE-640

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, 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 network access via multiple protocols 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 access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability 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. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).
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': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Subscriptions

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

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-24T03:07:54.796Z

Reserved: 2026-09-14T22:10:16.636Z

Link: CVE-2026-91464

cve-icon Vulnrichment

Updated: 2026-10-24T03:07:50.398Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:50.100

Modified: 2026-10-24T04:18:22.347

Link: CVE-2026-91464

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:26:06Z

Links: CVE-2026-91464 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-24T04:30:08Z

Weaknesses
  • CWE-303

    Incorrect Implementation of Authentication Algorithm

  • CWE-416

    Use After Free