CVE-2026-71120: Oracle Hyperion Financial Management DOS

CVE-2026-71120 Overview

CVE-2026-71120 is a denial of service vulnerability in Oracle Hyperion Financial Management, part of the Oracle Hyperion product family. The flaw resides in the Security component of version 11.2.25.0.000. A low-privileged attacker with network access over HTTP can trigger a hang or a frequently repeatable crash, resulting in a complete denial of service. The weakness is classified as [CWE-284] Improper Access Control. Oracle rated the exploit complexity as high, but successful exploitation renders Hyperion Financial Management unavailable to legitimate users.

Critical Impact
Authenticated network attackers can force a complete denial of service against Oracle Hyperion Financial Management deployments running version 11.2.25.0.000.

Affected Products

Oracle Hyperion Financial Management 11.2.25.0.000
Oracle Hyperion Financial Management Security component
Oracle Hyperion product family deployments exposing HTTP interfaces

Discovery Timeline

2026-08-18 - CVE-2026-71120 published to NVD
2026-08-18 - Oracle releases fix in the Oracle Security Alert August 2026
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-71120

Vulnerability Analysis

Oracle Hyperion Financial Management is an enterprise consolidation and financial reporting application. The vulnerability affects the Security component and enables an authenticated attacker to exhaust or corrupt resources through crafted HTTP requests. Successful exploitation forces the application to hang or crash on demand.

The attacker requires only low privileges within the application. No user interaction is required, and the impact remains scoped to availability. Confidentiality and integrity of financial data are not affected by this specific flaw. Oracle notes exploitation is difficult, indicating that specific conditions or precise request sequencing are required to reliably trigger the fault. The EPSS score is 0.281%.

Root Cause

Oracle categorizes the weakness under [CWE-284] Improper Access Control. The Security component fails to properly enforce constraints on requests submitted by low-privileged users, allowing those requests to reach code paths that destabilize the service. Oracle has not published a detailed technical breakdown of the underlying defect.

Attack Vector

The attack vector is network-based over HTTP. An attacker authenticates to Hyperion Financial Management with any valid low-privileged account and issues crafted requests to the vulnerable Security component endpoints. Repeated or specifically structured requests drive the application into an unresponsive state or a repeatable crash, producing a complete denial of service until administrators restart the service.

No verified proof-of-concept code is publicly available. See the Oracle Security Alert August 2026 for vendor guidance.

Detection Methods for CVE-2026-71120

Indicators of Compromise

Repeated unexpected service restarts of the Hyperion Financial Management application server
Sudden spikes in HTTP request volume from a single authenticated session targeting Security component endpoints
Application logs recording unhandled exceptions or thread hangs coinciding with low-privileged user activity
Users reporting inability to reach the Hyperion Financial Management web interface

Detection Strategies

Monitor Hyperion application server logs for repeated crashes, worker thread starvation, and abnormal shutdown events
Correlate authenticated session identifiers with request bursts to identify low-privileged accounts driving service instability
Baseline normal HTTP request patterns against the Security component and alert on statistical outliers

Monitoring Recommendations

Forward Hyperion Financial Management application, web, and OS event logs to a centralized SIEM for correlation
Enable availability monitoring with sub-minute health checks on Hyperion HTTP endpoints
Track authentication events and flag accounts generating disproportionate request volumes against Security endpoints

How to Mitigate CVE-2026-71120

Immediate Actions Required

Apply the patches published in the Oracle Security Alert August 2026 to all Oracle Hyperion Financial Management 11.2.25.0.000 deployments
Restrict network access to Hyperion Financial Management HTTP interfaces to trusted management networks only
Audit low-privileged accounts and disable unused or dormant credentials that could be leveraged for authenticated abuse
Enforce strong authentication and rotate credentials for any accounts with access to the application

Patch Information

Oracle addressed CVE-2026-71120 in the Oracle Critical Patch Update advisory dated August 2026. Administrators should follow the vendor advisory to identify the applicable patch bundle for Oracle Hyperion Financial Management 11.2.25.0.000 and validate installation in a test environment before deploying to production. Refer to the Oracle Security Alert August 2026 for full remediation guidance.

Workarounds

Place a web application firewall in front of Hyperion Financial Management to rate-limit authenticated requests to Security component endpoints
Segment the Hyperion environment so that only authorized internal users can reach the HTTP interface
Configure application server watchdogs to automatically recover crashed worker processes and reduce downtime while patching is scheduled

bash

# Example: restrict Hyperion HTTP access to a trusted management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP