CVE-2026-83378

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Memory Corruption in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-27

Assigner: Oracle

Description

Vulnerability in Oracle Java SE (component: Compiler). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 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 update, insert or delete access to some of Oracle Java SE accessible data as well as 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 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

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Meta Information

Published

2026-10-20

Last Modified

2026-10-27

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-83378

EUVD

EUVD-2026-106296

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	Oracle Java SE	21.0.12.1
Oracle Corporation	Oracle Java SE	25.0.4.1
Oracle Corporation	Oracle Java SE	27

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Java SE's Compiler component affecting versions 21.0.12.1, 25.0.4.1, and 27. It allows an unauthenticated attacker with network access to potentially modify or read some 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 or applets.

Detection Guidance

This vulnerability is specific to Oracle Java SE versions 21.0.12.1, 25.0.4.1, and 27. Detection requires checking installed Java versions and applying Oracle's security patches. Use commands like 'java -version' to verify installed versions and compare against affected releases. Monitor Oracle's security advisories for updates.

Impact Analysis

If exploited, this vulnerability could allow an attacker to read or modify some data within Oracle Java SE. This might lead to unauthorized access to sensitive information or unintended changes in data, depending on the application's use of the affected Java versions.

Compliance Impact

This vulnerability could potentially lead to unauthorized data access or modification, which may violate compliance requirements under GDPR (data protection) or HIPAA (health information privacy). Organizations using affected Java versions should assess their exposure and apply mitigations to maintain compliance.

Mitigation Strategies

Apply the latest Oracle Java SE patches for versions 21.0.12.1, 25.0.4.1, and 27. Update Java SE through official Oracle channels to address the vulnerability in the Compiler component.

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