CVE-2026-34290: Oracle Identity Manager Connector DoS Flaw

CVE-2026-34290 Overview

CVE-2026-34290 is a Denial of Service (DoS) vulnerability in the Oracle Identity Manager Connector product of Oracle Fusion Middleware, specifically affecting the Core component. This vulnerability allows an unauthenticated attacker with network access via TCP to cause a complete denial of service condition, resulting in a hang or frequently repeatable crash of the affected system. The vulnerability is classified as CWE-400 (Uncontrolled Resource Consumption), indicating improper handling of resource allocation that can be exploited to exhaust system resources.

Critical Impact

Unauthenticated remote attackers can cause complete denial of service to Oracle Identity Manager Connector, potentially disrupting identity management operations across the enterprise.

Affected Products

• Oracle Identity Manager Connector version 12.2.1.4.0
• Oracle Fusion Middleware (Core component)

Discovery Timeline

• April 21, 2026 - CVE-2026-34290 published to NVD
• April 23, 2026 - Last updated in NVD database

Technical Details for CVE-2026-34290

Vulnerability Analysis

This vulnerability resides in the Core component of Oracle Identity Manager Connector and represents a resource exhaustion condition that can be triggered remotely. The attack requires no authentication and no user interaction, making it particularly dangerous in network-exposed deployments. When exploited, the vulnerability causes the Identity Manager Connector to hang or crash repeatedly, effectively denying service to legitimate users and dependent systems.

The vulnerability is easily exploitable, requiring only network access via TCP to the vulnerable component. While the attack does not impact confidentiality or integrity of data, the availability impact is complete—meaning successful exploitation results in total loss of service availability for the targeted Oracle Identity Manager Connector instance.

Root Cause

The root cause of CVE-2026-34290 is CWE-400: Uncontrolled Resource Consumption. The Core component of Oracle Identity Manager Connector fails to properly limit or control resource allocation when processing certain network requests. This allows an attacker to send specially crafted TCP requests that consume excessive system resources, leading to resource exhaustion and subsequent service denial.

Attack Vector

The attack vector for this vulnerability is network-based, requiring TCP connectivity to the vulnerable Oracle Identity Manager Connector instance. The attack can be executed remotely without any authentication credentials or user interaction.

An attacker can exploit this vulnerability by sending malformed or excessive TCP requests to the Identity Manager Connector's listening port. The Core component's improper resource handling causes the service to allocate resources without proper bounds checking, eventually leading to resource exhaustion that manifests as a system hang or crash. The attack is repeatable, meaning an attacker can continuously trigger the denial of service condition even after system recovery attempts.

Detection Methods for CVE-2026-34290

Indicators of Compromise

• Unexpected service crashes or hangs in Oracle Identity Manager Connector processes
• Abnormal resource consumption patterns (CPU, memory exhaustion) on systems running the affected component
• Repeated restart events for the Oracle Identity Manager Connector service in system logs
• Unusual TCP connection patterns or volume targeting the Identity Manager Connector ports

Detection Strategies

• Implement network intrusion detection rules to monitor for anomalous TCP traffic patterns targeting Oracle Identity Manager Connector services
• Configure application performance monitoring to alert on resource utilization thresholds for the affected component
• Deploy log analysis to identify repeated crash events or service restart patterns indicative of DoS exploitation
• Use SentinelOne Singularity Platform to detect and respond to suspicious process behavior and resource exhaustion attempts

Monitoring Recommendations

• Enable detailed logging for Oracle Identity Manager Connector to capture connection attempts and resource allocation events
• Configure alerting for service availability monitoring to quickly identify denial of service conditions
• Implement network traffic analysis to baseline normal TCP patterns and detect deviations
• Monitor system resource metrics (CPU, memory, thread count) for the Identity Manager Connector process

How to Mitigate CVE-2026-34290

Immediate Actions Required

• Apply the security patch from Oracle's April 2026 Critical Patch Update as soon as possible
• Restrict network access to Oracle Identity Manager Connector to trusted networks and IP addresses only
• Implement rate limiting on network connections to the affected component
• Ensure monitoring and alerting is configured to detect denial of service conditions

Patch Information

Oracle has addressed this vulnerability in the April 2026 Critical Patch Update. Organizations running Oracle Identity Manager Connector version 12.2.1.4.0 should apply the relevant security patches immediately. Detailed patch information and download instructions are available in the Oracle Security Alert: April 2026.

Workarounds

• Implement network-level access controls (firewalls, ACLs) to restrict TCP access to Oracle Identity Manager Connector from untrusted networks
• Deploy a reverse proxy or load balancer with connection rate limiting capabilities in front of the vulnerable service
• Consider temporary service isolation if the patch cannot be applied immediately, limiting exposure to internal trusted networks only
• Enable TCP connection monitoring and implement automated blocking of source IPs exhibiting suspicious connection patterns

# Example: Restrict network access to Oracle Identity Manager Connector using iptables
# Allow connections only from trusted network (adjust IP range as needed)
iptables -A INPUT -p tcp --dport <CONNECTOR_PORT> -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport <CONNECTOR_PORT> -j DROP

# Example: Connection rate limiting to mitigate DoS attempts
iptables -A INPUT -p tcp --dport <CONNECTOR_PORT> -m state --state NEW -m recent --set
iptables -A INPUT -p tcp --dport <CONNECTOR_PORT> -m state --state NEW -m recent --update --seconds 60 --hitcount 20 -j DROP