CVE-2026-101587
Published:October 20, 2026
Updated:October 23, 2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient-http1). Supported versions that are affected are 4.0.0-4.5.5 and 27.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. 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 Packages
https://github.com/helidon-io/helidon.git (GITHUB):
Affected version(s) >=4.0.0-ALPHA1 <4.5.6Fix Suggestion:
Update to version 4.5.6https://github.com/helidon-io/helidon.git (GITHUB):
Affected version(s) >=27.0.0-M1 <27.0.1Fix Suggestion:
Update to version 27.0.1io.helidon.webclient:helidon-webclient-http1 (JAVA):
Affected version(s) >=4.0.0-M2 <4.5.6Fix Suggestion:
Update to version 4.5.6io.helidon.webclient:helidon-webclient-http1 (JAVA):
Affected version(s) >=27.0.0-M1 <27.0.1Fix Suggestion:
Update to version 27.0.1Related 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
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
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
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Uncontrolled Resource Consumption
EPSS
Base Score:
0.39