Description
Vulnerability in Oracle Java SE (component: Libraries). 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; 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 ability to cause a partial denial of service (partial DOS) of Oracle Java SE. 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 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
Published: 2026-10-20
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Partial Denial of Service
Action: Apply Patch
AI Analysis

Impact

A vulnerability in Oracle Java SE libraries enables an unauthenticated attacker with network access to trigger resource exhaustion and partial denial of service. The flaw stems from improper input validation (CWE‑400) and concurrent modification (CWE‑409) within the zip file system component, allowing malicious requests to consume memory and CPU that lead to degraded or interrupted service.

Affected Systems

Oracle Java SE versions 8u503, 8u503‑perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, and 25.0.4.1 are affected, as are Oracle GraalVM for JDK 17.0.20.1 and 21.0.12.1, and Oracle GraalVM Enterprise Edition 21.3.19.1.1. All affected products share the vulnerable Libraries component.

Risk and Exploitability

The CVSS base score of 5.3 indicates a medium availability impact under a network attack with low complexity and no user interaction. The EPSS score of <1% signals a very low likelihood of exploitation, and the vulnerability is not listed in the CISA KEV catalog. Likely attack paths involve exposed API endpoints or network services that parse untrusted input, enabling an attacker to trigger the flaw without authentication and cause a partial denial of service.

Generated by OpenCVE AI on October 23, 2026 at 05:18 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the vendor‑issued patches for the affected Java SE releases, which fix the underlying library bug.
  • Upgrade to a newer Java SE version that includes the fix if a patch is not available.
  • Restrict inbound network traffic to services exposing the vulnerable APIs to reduce the attack surface.
  • Enable strict input validation and size limits on the vulnerable APIs, and enforce concurrency controls to prevent resource exhaustion.
  • Monitor JVM resource usage (memory, threads, CPU) and set alerts for abnormal spikes to detect potential ongoing attacks.

Generated by OpenCVE AI on October 23, 2026 at 05:18 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
Weaknesses CWE-400
Metrics ssvc

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

Thu, 22 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

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

Type Values Removed Values Added
Title Unauthenticated Network Attack Causing Partial Denial of Service in Oracle Java SE Libraries openjdk: Enhance zipfs (Oracle CPU 2026-10)
Weaknesses CWE-409
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 17:45:00 +0000

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

Wed, 21 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Title Unauthenticated Network Attack Causing Partial Denial of Service in Oracle Java SE Libraries
Weaknesses CWE-400

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

Type Values Removed Values Added
Description Vulnerability in Oracle Java SE (component: Libraries). 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; 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 ability to cause a partial denial of service (partial DOS) of Oracle Java SE. 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 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
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:8u503:*:*:*:*:*:*:*
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:N/A:L'}

Subscriptions

Oracle Java Se Oracle Java Se
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-22T18:50:23.564Z

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

Link: CVE-2026-91410

cve-icon Vulnrichment

Updated: 2026-10-22T18:43:00.231Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:44.373

Modified: 2026-10-22T19:18:04.887

Link: CVE-2026-91410

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-91410 - Bugzilla

cve-icon OpenCVE Enrichment

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

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption

  • CWE-409

    Improper Handling of Highly Compressed Data (Data Amplification)