CVE-2026-91453
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Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-22

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Lightweight HTTP Server). 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 update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. 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).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-22
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91453
EUVD
EUVD-2026-106703

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

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Executive Summary

This is a vulnerability in Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition affecting multiple versions. It involves the Lightweight HTTP Server component and allows unauthenticated attackers to remotely access and modify some data via network protocols. The attack requires supplying data to specific APIs without using Java Web Start or applets.

Detection Guidance

Detection involves checking for vulnerable versions of Oracle Java SE, Oracle GraalVM for JDK, or Oracle GraalVM Enterprise Edition. Use commands like 'java -version' or 'gu -version' to identify installed versions. Compare against affected versions listed in the CVE.

Impact Analysis

An attacker could exploit this to modify data in the affected Oracle Java products. This could lead to unauthorized changes in applications or services using these versions, potentially causing data corruption or incorrect operations.

Compliance Impact

This vulnerability allows unauthorized modification of data, which could lead to violations of integrity requirements in standards like GDPR (data integrity principles) and HIPAA (integrity of protected health information). Unauthorized data changes may result in non-compliance if such incidents are not detected or addressed promptly.

Mitigation Strategies

Update affected Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition versions to the latest patched releases immediately. Monitor Oracle's security advisories for updates and apply them as soon as possible.

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