CVE-2026-73912 in Helidon
Summary
by MITRE • 08/19/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in takeover of Helidon. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the Imperative Web Server component of Oracle Fusion Middleware Helidon, specifically affecting version 4.5.0. This critical security flaw permits an unauthenticated attacker to achieve complete system compromise through network access via HTTP. The severity of this issue is underscored by a CVSS v3.1 base score of 9.8, indicating that the vulnerability has high impacts on confidentiality, integrity, and availability. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) confirms that no authentication is required, the attack complexity is low, and there are no user interaction requirements, making it highly exploitable by remote adversaries with basic network connectivity to the target system.
From a technical perspective, this vulnerability likely stems from insufficient input validation or improper handling of HTTP requests within the imperative web server implementation. Such flaws often allow attackers to inject malicious payloads that bypass security controls, leading to arbitrary code execution or denial of service conditions. The ability for an unauthenticated actor to take over the Helidon instance suggests a fundamental breakdown in access control mechanisms or request processing logic. This could involve buffer overflow vulnerabilities, deserialization issues, or improper parsing of HTTP headers and bodies that allow attackers to execute commands with the privileges of the application process.
The operational impact of this vulnerability is severe due to its high availability score and full compromise potential. An attacker who successfully exploits this flaw can gain unauthorized access to sensitive data stored within the Helidon environment, modify system configurations or data integrity, and disrupt service availability by crashing the server or consuming excessive resources. This effectively results in a complete takeover of the affected component, potentially serving as an entry point for further lateral movement within the broader Oracle Fusion Middleware infrastructure. The lack of authentication requirements means that any entity with network reachability to port 80 can attempt exploitation, significantly expanding the attack surface.
To mitigate this risk, immediate action is required to apply vendor-provided patches or updates that address the specific flaw in Helidon version 4.5.0. Organizations should verify their deployment configurations and ensure that all instances of the affected component are updated to a secure version where these input validation and access control issues have been resolved. In addition to patching, implementing network-level controls such as Web Application Firewalls can help detect and block malicious HTTP requests before they reach the vulnerable application layer. It is also advisable to restrict direct internet exposure of Helidon services by placing them behind reverse proxies with strict access policies and monitoring logs for signs of exploitation attempts aligned with known attack patterns associated with CWE-20 Improper Input Validation or CWE-78 OS Command Injection, depending on the specific nature of the code execution vector.