CVE-2026-73882 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 3.2.19. 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 hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 3.2.19. This security flaw represents a significant risk to the availability and stability of applications deployed on this platform. The core issue is characterized by an easily exploitable condition that allows for remote code execution leading to service disruption rather than data compromise or privilege escalation in the traditional sense. The vulnerability stems from improper handling of specific HTTP requests, where malformed or specifically crafted inputs trigger internal state corruption or resource exhaustion within the server's request processing pipeline. This flaw enables an unauthenticated attacker who has network access via HTTP to exploit the weakness without requiring any form of authentication credentials.
From a technical perspective, the exploitation mechanism relies on sending specially constructed HTTP traffic that triggers a logic error or memory management issue within the Helidon web server implementation. When such maliciously crafted requests are processed, they cause the application thread handling the request to enter an unrecoverable state. This results in either a complete hang of the service for that specific connection or session, or more critically, a repeatable crash of the entire Helidon process. The ability to frequently and reliably reproduce this crash means that an attacker can sustainably deny service to legitimate users by continuously sending these triggering payloads. The impact is strictly categorized under availability impacts, as confirmed by the CVSS 3.1 base score of 7.5 which reflects high severity due to the ease of exploitation and the complete loss of service capability.
The operational impact of this vulnerability is severe for any organization relying on Helidon version 3.2.19 for their web services. A successful attack leads to a Denial of Service (DoS) condition, rendering the application inaccessible to end-users. Since the exploit requires no authentication and can be executed over standard HTTP networks, it is particularly dangerous in environments where the service is exposed directly to untrusted networks or the internet without sufficient front-end protection. The repeatable nature of the crash means that mitigation cannot rely on simple rate limiting alone if the underlying code flaw remains; however, network-level controls can help mitigate exposure until a patch is applied. This vulnerability aligns with CWE-20 Improper Input Validation and CWE-400 Uncontrolled Resource Consumption, as it involves failing to properly validate or sanitize incoming HTTP data before processing, leading to resource exhaustion or state corruption.
In terms of threat modeling, this vulnerability maps directly to the ATT&CK technique T1499 Endpoint Denial of Service, specifically under the sub-category of Oscillation which describes making a service repeatedly crash and restart. It also relates to T1059 Command Line Interface if the underlying cause involves executing system commands through injection, though the primary vector here is HTTP-based resource exhaustion or logic error exploitation. The lack of authentication requirements places this in the initial access phase of an attack chain, although its utility is limited to disruption rather than persistence or lateral movement unless combined with other vulnerabilities.
To mitigate this risk, immediate action should be taken by upgrading Oracle Fusion Middleware Helidon to a version that includes patches for this specific issue. If upgrading is not immediately feasible, organizations should implement network-level controls such as Web Application Firewalls (WAF) configured to detect and block anomalous HTTP request patterns associated with the exploit vector. Additionally, deploying reverse proxies in front of the Helidon instance can help absorb and filter malicious traffic before it reaches the vulnerable application server. Monitoring logs for signs of repeated crashes or high error rates related to HTTP processing can aid in early detection of exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar input validation flaws across other components of the middleware stack, ensuring a holistic approach to securing the infrastructure against availability-focused attacks.