Description
Vulnerability in Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 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. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE 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 5.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).
Published: 2026-10-20
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized data modification (integrity loss)
Action: Immediate Patch
AI Analysis

Impact

Oracle Java SE contains a vulnerability in its Networking component that can be triggered by an unauthenticated network attacker. An attacker with network access using any supported protocol can exploit the flaw to gain unauthorized write rights. Successful exploitation results in modification, insertion or deletion of data that the Java runtime can access, compromising data integrity.

Affected Systems

Affected systems include Oracle Java SE Enterprise Performance 8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1 and 27, as well as Oracle GraalVM for JDK 17.0.20.1 and 21.0.12.1 and Oracle GraalVM Enterprise Edition 21.3.19.1.1.

Risk and Exploitability

The CVSS base score of 5.3 indicates moderate risk with a modest integrity impact. The EPSS score is < 1%, indicating a very low but non‑zero exploitation probability, and the vulnerability is not listed in the CISA KEV catalog. The flaw is classified as an unauthenticated network‑remote exploitation. An attacker requires only network connectivity and does not need any advanced privileges, making the attack path straightforward. Because the flaw is tied to the Networking component, any service or application exposing Java networking APIs is a potential attack surface.

Generated by OpenCVE AI on October 23, 2026 at 05:20 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle Java SE and GraalVM security updates that include a fix for the networking component.
  • Restrict network access to Java applications that expose networking APIs by implementing firewall rules or network segmentation to limit inbound protocols that can be used for exploitation.
  • For client deployments, disable or restrict Java Web Start and applet functionality, and enforce strict sandboxing for code loaded from untrusted sources.

Generated by OpenCVE AI on October 23, 2026 at 05:20 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 00:45:00 +0000

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

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

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 Network Access Allows Unauthorized Data Modification in Oracle Java SE openjdk: Enhance HTTP Client (Oracle CPU 2026-10)
Weaknesses CWE-444
References
Metrics threat_severity

None

 threat_severity

Moderate

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

Type Values Removed Values Added
Title Unauthenticated Network Access Allows Unauthorized Data Modification in Oracle Java SE
Weaknesses CWE-284

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

Type Values Removed Values Added
Description Vulnerability in Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 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. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE 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 5.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).
First Time appeared Oracle
Oracle java Se
CPEs 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:*:*:*:enterprise_performance:*:*:*
Vendors & Products Oracle
Oracle java Se
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Subscriptions

Oracle Java Se Oracle Java Se
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-22T18:50:26.421Z

Reserved: 2026-09-14T22:10:16.628Z

Link: CVE-2026-91332

cve-icon Vulnrichment

Updated: 2026-10-22T18:48:18.859Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:35.387

Modified: 2026-10-22T19:18:03.703

Link: CVE-2026-91332

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:25:21Z

Links: CVE-2026-91332 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T05:30:03Z

Weaknesses
  • CWE-284

    Improper Access Control

  • CWE-444

    Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')