Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK product of Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK. 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 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 5.9 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
Published: 2026-10-20
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized Access to Critical Data
Action: Apply Patch
AI Analysis

Impact

A flaw in the networking component of Oracle Java SE and Oracle GraalVM for JDK allows an unauthenticated network attacker to read cached data that should remain confidential. The vulnerability enables unauthorized access to critical information handled by the Java components. Attackers can trigger this flaw through exposed APIs or services that use the vulnerable networking libraries.

Affected Systems

Oracle Java SE versions 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, and 27, along with Oracle GraalVM for JDK versions 17.0.20.1 and 21.0.12.1, are affected. These products are widely used in enterprise environments, including client‑side sandboxed applications such as Java Web Start and applets that load code from the internet.

Risk and Exploitability

The CVSS base score of 5.9 indicates moderate severity with a primary confidentiality impact. The EPSS score of less than 1% shows a very low but nonzero probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Likely attack paths involve unauthenticated network connections to exposed HTTP client APIs, allowing an attacker to retrieve unintended cached data or gain unauthorized data access.

Generated by OpenCVE AI on October 23, 2026 at 05:55 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Retrieve and deploy any available security updates from Oracle for the affected Java SE and GraalVM for JDK versions.
  • Disable or restrict the vulnerable HTTP client caching functionality by configuring the appropriate system properties or removing the affected component from the application classpath.
  • Enforce the Java security manager or enable the sandbox to block untrusted code from accessing networking APIs.
  • Audit exposed networking services that use the vulnerable APIs and limit them to authorized clients only.

Generated by OpenCVE AI on October 23, 2026 at 05:55 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-200
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 oracle Java Se
Vendors & Products Oracle oracle Java Se

Thu, 22 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284

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

Type Values Removed Values Added
Title Unauthenticated Network-Based Access to Oracle Java SE and GraalVM for JDK openjdk: Enhance HTTP client caching (Oracle CPU 2026-10)
Weaknesses CWE-524
References
Metrics threat_severity

None

 threat_severity

Moderate

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

Type Values Removed Values Added
Title Unauthenticated Network-Based Access to Oracle Java SE and GraalVM for JDK
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 product of Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK. 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 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 5.9 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
First Time appeared Oracle
Oracle graalvm For Jdk
Oracle java Se
CPEs 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:*:*:*:*:*:*:*
Vendors & Products Oracle
Oracle graalvm For Jdk
Oracle java Se
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Subscriptions

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

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-23T02:22:02.263Z

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

Link: CVE-2026-91394

cve-icon Vulnrichment

Updated: 2026-10-23T02:21:57.263Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:42.727

Modified: 2026-10-23T03:16:31.533

Link: CVE-2026-91394

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-91394 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T06:00:13Z

Weaknesses
  • CWE-200

    Exposure of Sensitive Information to an Unauthorized Actor

  • CWE-524

    Use of Cache Containing Sensitive Information