Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JAXP). 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. Easily exploitable 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 partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. 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: Denial of Service
Action: Patch
AI Analysis

Impact

This vulnerability resides in the JAXP component of Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition. An unauthenticated attacker with network access can exploit the flaw by sending crafted XML payloads through exposed APIs, which leads to a partial denial of service. The impact is limited to availability; confidentiality and integrity are not affected. The weakness underlies improper handling of XML input that can exhaust resources or disrupt service operation.

Affected Systems

Oracle products affected include Oracle Java SE (versions 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) and Oracle GraalVM Enterprise Edition (21.3.19.1.1). All other releases are considered unaffected unless explicitly noted by Oracle).

Risk and Exploitability

The CVSS score is 5.3, reflecting a moderate availability impact with low attack complexity, no authentication, and no user interaction required. The EPSS score is < 1%, indicating a very low exploitation probability. This vulnerability is not listed in the CISA KEV catalog. The likely attack vector is network‑based, targeting any exposed services or applications that use JAXP APIs, including web services or sandboxed Java web start applications that load untrusted code.

Generated by OpenCVE AI on October 23, 2026 at 05:22 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Oracle Java SE security patches so that the installed Java version is beyond 8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, and 27.
  • Upgrade Oracle GraalVM for JDK to a release newer than 17.0.20.1 and 21.0.12.1 or install the corresponding patch updates.
  • Upgrade Oracle GraalVM Enterprise Edition to a post‑21.3.19.1.1 release or apply the available security fix.
  • Configure XML APIs to validate input thoroughly and enforce size or length limits to mitigate uncontrolled resource consumption.
  • Implement limits on resource generation and usage within JAXP processing, such as setting maximum recursion depth or thread pool size, to prevent denial‑of‑service conditions (addresses CWE-776).

Generated by OpenCVE AI on October 23, 2026 at 05:22 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 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Oracle graalvm Enterprise Edition
Oracle oracle Java Se
Weaknesses CWE-400
Vendors & Products Oracle graalvm Enterprise Edition
Oracle oracle Java Se
Metrics ssvc

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

Thu, 22 Oct 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

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

Type Values Removed Values Added
Title Partial Denial of Service via JAXP in Oracle Java and GraalVM openjdk: Enhance XML Processing (Oracle CPU 2026-10)
Weaknesses CWE-776
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 07:00:00 +0000

Type Values Removed Values Added
Title Partial Denial of Service via JAXP in Oracle Java and GraalVM
Weaknesses CWE-400

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: JAXP). 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. Easily exploitable 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 partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. 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 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:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Subscriptions

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

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-22T18:50:24.014Z

Reserved: 2026-08-31T15:40:57.357Z

Link: CVE-2026-83400

cve-icon Vulnrichment

Updated: 2026-10-22T18:43:20.652Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:19:56.540

Modified: 2026-10-22T19:18:02.657

Link: CVE-2026-83400

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:23:46Z

Links: CVE-2026-83400 - Bugzilla

cve-icon OpenCVE Enrichment

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

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption

  • CWE-776

    Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')