---
id: CVE-2026-91373
title: 'Vulnerability in Oracle Java SE (component: JSSE)'
summary: >-
  Vulnerability in Oracle Java SE (component: JSSE).  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 E…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
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: '2026-10-20T21:25:36.496Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91373'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
ingestedAt: '2026-10-20T22:23:33.782Z'
---

## Overview

Vulnerability in Oracle Java SE (component: JSSE).  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 TLS to compromise Oracle Java SE.  Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE. 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 5.3 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

## 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.