CVE-2026-87291
Published:October 20, 2026
Updated:October 28, 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).
Affected Packages
https://github.com/openjdk/jdk25u.git (GITHUB):
Affected version(s) >=jdk-25.0.5+0 <jdk-25.0.5-gaFix Suggestion:
Update to version jdk-25.0.5-gahttps://github.com/openjdk/jdk21u.git (GITHUB):
Affected version(s) >=jdk-21.0.13+0 <jdk-21.0.13-gaFix Suggestion:
Update to version jdk-21.0.13-gahttps://github.com/openjdk/jdk27u.git (GITHUB):
Affected version(s) =jdk-27.0.1+0 <jdk-27.0.1-gaFix Suggestion:
Update to version jdk-27.0.1-gaRelated Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Authentication
EPSS
Base Score:
0.33