---
id: CVE-2026-91451
title: 'Vulnerability in Oracle Java SE (component: Networking)'
summary: >-
  Vulnerability in 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; Oracle GraalVM for JDK: 17.0.20.1 and  21.0.12.1; Oracle
  Gra…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
vendor: Oracle Corporation
product: Oracle Java SE
affected:
  - oracle_java_se 8u503
  - oracle_java_se 8u503-perf
  - 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
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T21:26:02.855Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91451'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
ingestedAt: '2026-10-20T22:23:33.751Z'
---

## Overview

Vulnerability in 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; 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.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Oracle Java SE 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).

## Affected

- `oracle_java_se 8u503`
- `oracle_java_se 8u503-perf`
- `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`

## Remediation

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