CVE-2026-91464
Awaiting Analysis Awaiting Analysis - Queue

Authentication Bypass in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-24

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JGSS). 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 multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability 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. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-20
Last Modified
2026-10-24
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91464
EUVD
EUVD-2026-106712

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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 affecting multiple versions. It allows an unauthenticated attacker with network access to potentially access sensitive data through the JGSS component. Exploitation requires user interaction and is difficult to perform. The impact is limited to confidentiality, with no integrity or availability impact.

Detection Guidance

This vulnerability affects Java deployments running untrusted code in sandboxed environments like Java Web Start or applets. Detection involves checking installed Java versions against affected releases (8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27). Use commands like 'java -version' or check package managers (e.g., 'apt list --installed | grep jdk' on Debian/Ubuntu). Monitor network traffic for suspicious interactions with Java components.

Impact Analysis

If you use affected Java versions in client environments running untrusted code (like Java Web Start or applets), an attacker could access critical data. Server environments running only trusted code are not affected. The risk is higher for systems processing sensitive information.

Compliance Impact

This vulnerability allows unauthorized access to critical data, which could lead to breaches of sensitive information. For GDPR, this may result in unauthorized data access violating principles of data protection and user rights. For HIPAA, it could compromise protected health information, leading to compliance violations and potential penalties.

Mitigation Strategies

Upgrade to patched Java versions immediately (e.g., 8u511, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.1). Disable Java Web Start and applets if unused. Restrict network access to Java applications via firewalls. Apply vendor patches from Oracle's October 2026 updates. Prioritize systems running untrusted Java code.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-91464. 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...