CVE-2026-91398
Awaiting Analysis Awaiting Analysis - Queue

Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-23

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Networking). 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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via SOCKS5 to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. While the vulnerability is in Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition 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 6.8 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N).

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-20
Last Modified
2026-10-23
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91398
EUVD
EUVD-2026-106652

Helpful Resources

Exploitability

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

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a vulnerability in Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition. It allows an unauthenticated attacker with network access via SOCKS5 to compromise these products. The vulnerability can lead to unauthorized creation, deletion, or modification of critical data within the affected systems.

Detection Guidance

Detection involves checking for affected Java versions. Use commands like 'java -version' or 'where java' to identify installed versions. Compare against vulnerable versions listed (8u503, 11.0.32.1, 17.0.20.1, etc.). Monitor network traffic for SOCKS5 connections to Java services.

Impact Analysis

If exploited, this vulnerability could allow attackers to alter or delete sensitive data in systems running vulnerable versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition. It may also impact other connected products due to scope changes.

Compliance Impact

This vulnerability allows unauthorized modification of critical data, which could lead to violations of data integrity requirements in GDPR and HIPAA. Unauthorized data changes may result in non-compliance with these regulations, potentially leading to legal penalties and loss of certification.

Mitigation Strategies

Apply Oracle's security patches immediately for affected Java versions. Disable SOCKS5 proxy support if not required. Restrict network access to Java services. Update Java deployments in sandboxed environments to patched versions.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-91398. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart

Security Radar

News mentioning this vulnerability
Loading related security news...