CVE-2026-87255

Received Received - Intake

Oracle Java SE Compiler Unauthorized Data Access Vulnerability

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: Oracle

Description

Vulnerability in Oracle Java SE (component: Compiler). Supported versions that are affected are Oracle Java SE: 25.0.4.1 and 27. Difficult to exploit 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 3.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-20

Generated

2026-10-21

AI Q&A

2026-10-21

EPSS Evaluated

N/A

NVD

CVE-2026-87255

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle	Corporation	Oracle Java SE 25.0.4.1
Oracle	Corporation	Oracle Java SE 27

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Java SE's Compiler component affecting versions 25.0.4.1 and 27. It allows an unauthenticated attacker with network access to potentially read a subset of data in Oracle Java SE through multiple protocols. The attack is difficult to exploit and requires supplying data to specific APIs without using Untrusted Java Web Start applications or applets.

Detection Guidance

This vulnerability is specific to Oracle Java SE versions 25.0.4.1 and 27 and requires detecting outdated Java installations. Check installed Java versions using commands like 'java -version' or 'where java' on Windows, or 'which java' on Unix-like systems. Verify if the installed version matches affected releases.

Impact Analysis

If exploited, this vulnerability could allow unauthorized access to some data within Oracle Java SE. The impact is limited to confidentiality, meaning attackers could read certain data but not modify or delete it. The difficulty of exploitation and limited data access reduce the overall risk.

Mitigation Strategies

Apply the latest Oracle Java SE security patches immediately. Update to a non-vulnerable version of Oracle Java SE. Disable unnecessary Java services and restrict network access to Java applications where possible. Monitor Oracle's security advisories for updates.

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