---
id: CVE-2026-87291
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: 21.0.12.1, 25.0.4.1 and  27. Easily
  exploitable vulnerability allows unauthenticated attacker with network access
  via mult…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: Oracle Corporation
product: Oracle Java SE
affected:
  - oracle_java_se 21.0.12.1
  - oracle_java_se 25.0.4.1
  - oracle_java_se 27
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-27T18:52:31.288192Z'
published: '2026-10-20'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T18:52:59.378Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-87291'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87291.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-87291'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2557056'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-87291'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87291'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00325
epssPercentile: 0.25395
ingestedAt: '2026-10-20T22:23:33.873Z'
---

## Overview

Vulnerability in Oracle Java SE (component: Networking).  Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and  27. 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 read access to a subset 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 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

## Affected

- `oracle_java_se 21.0.12.1`
- `oracle_java_se 25.0.4.1`
- `oracle_java_se 27`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat build of OpenJDK 21, Red Hat build of OpenJDK 25, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat build of OpenJDK 21, Red Hat build of OpenJDK 25, … · updated 2026-10-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87291.json)