Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. 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).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-18T21:18:17.703Z",
  "pubdate": "2026-08-18T21:18:17.703Z",
  "executiveSummary": "An easily exploitable vulnerability exists within the Imperative Web Server component of Oracle Fusion Middleware Helidon, specifically affecting version 3.2.18. This critical security flaw allows unauthenticated attackers with network access to compromise the affected system entirely via HTTP requests.\nSuccessful exploitation of this vulnerability results in a complete system takeover, granting the adversary full control over the confidentiality, integrity, and availability of the Helidon instance. With a CVSS 3.1 Base Score of 9.8 and a vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, the risk profile is extremely severe.\nThe attack requires no user interaction, low attack complexity, and no prior privileges, making it highly attractive for automated exploitation over public or internal networks. Immediate remediation is required to prevent unauthorized remote execution and total infrastructure compromise.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of the Oracle Fusion Middleware Helidon product, specifically impacting version 3.2.18. The architectural design of the affected web server facilitates improper input validation or insecure request processing flaws when handling incoming HTTP streams.\nExploitation is conducted remotely over the network via the HTTP protocol without requiring any authentication credentials or user interaction. An unauthenticated attacker leverages low attack complexity to send a specially crafted HTTP payload directly to the exposed network port of the vulnerable Helidon instance.\nUpon receipt, the Imperative Web Server component fails to adequately sanitize or restrict the malicious input, leading to a severe memory corruption, deserialization, or logic flaw depending on the underlying vector implementation. This flaw permits the execution of arbitrary commands or code within the context of the running application process.\nThe post-exploitation impact includes complete system takeover. Because the process runs with the privileges of the Helidon service, the attacker gains full read, write, and execute capabilities over the compromised environment, effectively neutralizing all confidentiality, integrity, and availability guarantees of the host application."
}