Oracle Java SE Net CVE-2026-87291: Unauth Read APIs (21.0.12.1, 25.0.4.1, 27)
CVE-2026-87291 Published on October 20, 2026
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).
Vulnerability Analysis
CVE-2026-87291 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-87291 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-87291
stack.watch emails you whenever new vulnerabilities are published in Oracle or Oracle Java. Just hit a watch button to start following.
Affected Versions
Oracle Corporation Oracle Java SE:- Version 21.0.12.1 is affected.
- Version 25.0.4.1 is affected.
- Version 27 is affected.