---
id: CVE-2026-91394
title: >-
  Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK product of Oracle
  Java SE (component: Networking)
summary: >-
  Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK product of Oracle
  Java SE (component: Networking).  Supported versions that are affected are
  Oracle Java SE: 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM
  for JD…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
vendor: Oracle Corporation
product: Oracle Java SE
affected:
  - oracle_java_se 11.0.32.1
  - oracle_java_se 17.0.20.1
  - oracle_java_se 21.0.12.1
  - oracle_java_se 25.0.4.1
  - oracle_java_se 27
  - oracle_graalvm_for_jdk 17.0.20.1
  - oracle_graalvm_for_jdk 21.0.12.1
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T21:25:44.100Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91394'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
ingestedAt: '2026-10-20T22:23:33.776Z'
---

## Overview

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK product of Oracle Java SE (component: Networking).  Supported versions that are affected are Oracle Java SE: 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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK.  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 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 5.9 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

## Affected

- `oracle_java_se 11.0.32.1`
- `oracle_java_se 17.0.20.1`
- `oracle_java_se 21.0.12.1`
- `oracle_java_se 25.0.4.1`
- `oracle_java_se 27`
- `oracle_graalvm_for_jdk 17.0.20.1`
- `oracle_graalvm_for_jdk 21.0.12.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.