CVE-2026-87148: Oracle Hyperion DRM DOS Vulnerability

CVE-2026-87148 Overview

CVE-2026-87148 is a denial-of-service vulnerability in Oracle Hyperion Data Relationship Management, part of the Oracle Hyperion product family. The flaw resides in the Access and security component and affects version 11.2.26.0.000. An unauthenticated attacker with network access over HTTP can trigger a hang or repeatable crash that results in complete service unavailability. The weakness is classified as uncontrolled resource consumption [CWE-400]. Oracle disclosed the issue in its September 2026 Security Alert advisory.

Critical Impact
A remote unauthenticated attacker can force a complete denial of service against Oracle Hyperion Data Relationship Management, disrupting master data governance workflows for downstream Hyperion applications.

Affected Products

Oracle Hyperion Data Relationship Management 11.2.26.0.000
Oracle Hyperion product family (Access and security component)
Deployments exposing the Hyperion DRM web interface over HTTP

Discovery Timeline

2026-09-15 - CVE-2026-87148 published to the National Vulnerability Database
2026-09-16 - Last updated in NVD database
2026 - Oracle publishes Security Alert CSPUSEP2026 with remediation guidance

Technical Details for CVE-2026-87148

Vulnerability Analysis

The vulnerability affects the Access and security component of Oracle Hyperion Data Relationship Management (DRM), a master data management platform used to govern hierarchies shared across Hyperion planning and consolidation systems. An unauthenticated attacker sends crafted HTTP requests to the DRM service and forces the application into a hung or repeatedly crashing state. The result is complete loss of availability without any impact to confidentiality or integrity. Because DRM commonly serves as an upstream authority for financial and operational hierarchies, an outage propagates into dependent Hyperion Financial Management and Planning workflows. The Exploit Prediction Scoring System places the near-term exploitation probability at 0.338% (27th percentile) as of 2026-09-16.

Root Cause

The issue is categorized under [CWE-400] Uncontrolled Resource Consumption. The DRM service does not adequately bound the resources consumed while parsing or processing certain HTTP-borne inputs in the Access and security component. Repeated or malformed requests exhaust processing capacity or trigger an unrecoverable exception path, driving the service to hang or crash.

Attack Vector

Exploitation requires only network reachability to the DRM HTTP endpoint. No credentials, user interaction, or elevated privileges are needed, and attack complexity is low. Any actor able to route HTTP traffic to the DRM instance — including internal users on a flat network or external attackers when the service is exposed to the internet — can trigger the condition.

No public proof-of-concept, exploit module, or in-the-wild exploitation has been documented. See the Oracle Security Alert CSPUSEP2026 for authoritative technical details.

Detection Methods for CVE-2026-87148

Indicators of Compromise

Unexpected service hangs, worker thread exhaustion, or repeated process restarts of the Oracle Hyperion DRM application server.
Spikes in HTTP request volume or anomalous request patterns targeting DRM Access and security endpoints from a single source.
Application error logs showing unhandled exceptions or resource-allocation failures coinciding with inbound HTTP traffic.

Detection Strategies

Monitor DRM availability with synthetic HTTP probes and alert on repeated failure or elevated response latency.
Correlate web server access logs with application crash events to identify request patterns that precede service failure.
Deploy network intrusion detection signatures for high-rate or malformed HTTP requests against DRM endpoints.

Monitoring Recommendations

Track CPU, memory, and thread-pool utilization on DRM hosts and alert on sustained saturation.
Forward DRM application, IIS or web server, and operating system logs to a centralized SIEM for correlation and retention.
Baseline normal HTTP request rates to DRM and generate alerts on statistically significant deviations.

How to Mitigate CVE-2026-87148

Immediate Actions Required

Inventory all Oracle Hyperion DRM deployments and identify instances running version 11.2.26.0.000.
Apply the patch referenced in Oracle Security Alert CSPUSEP2026 as soon as change windows permit.
Restrict network exposure of the DRM HTTP interface to trusted management networks and remove any internet exposure.
Enable rate limiting and web application firewall protections in front of the DRM service.

Patch Information

Oracle addresses this vulnerability in the fixes distributed with Oracle Security Alert CSPUSEP2026. Administrators should consult the alert for the exact patch bundle applicable to their Hyperion DRM deployment and validate the update in a non-production environment before rollout.

Workarounds

Place the DRM service behind a reverse proxy or web application firewall configured with request-rate and request-size limits.
Segment DRM hosts on isolated network zones accessible only to authorized administrative and integration systems.
Implement automated service watchdogs to restart the DRM process on failure while the patch is being staged.

bash

# Example: restrict HTTP access to Oracle Hyperion DRM to a trusted subnet
# (Windows firewall rule; adjust port and subnet to match your deployment)
netsh advfirewall firewall add rule name="Hyperion DRM - Trusted Only" ^
  dir=in action=allow protocol=TCP localport=<DRM_HTTP_PORT> ^
  remoteip=10.10.20.0/24

netsh advfirewall firewall add rule name="Hyperion DRM - Block Other" ^
  dir=in action=block protocol=TCP localport=<DRM_HTTP_PORT>