CVE-2026-15562 in jboss-remoting
Summary
by MITRE • 08/11/2026
A flaw was found in EAP's jboss-remoting. A remote unauthenticated attacker who can reach :8080 (or :9990, or :4447) and complete an Upgrade: jboss-remoting handshake can cause OOM errors that degrade requests server-wide, leading to denial of service.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability resides within the jboss-remoting component of the Enterprise Application Platform, specifically targeting the remoting protocol implementation that handles network communication between servers and clients. The flaw manifests as a denial of service condition that can be triggered through a carefully crafted Upgrade header negotiation process. Attackers exploiting this weakness need only reach the target system on one of the specified ports - 8080 for HTTP, 9990 for management interface, or 4447 for the remoting protocol itself. The vulnerability operates at the protocol level where the jboss-remoting handshake process fails to properly validate incoming connection upgrade requests, allowing malicious actors to consume excessive system resources.
The technical mechanism behind this vulnerability involves memory allocation exhaustion during the Upgrade: jboss-remoting handshake sequence. When an attacker establishes a connection and initiates the upgrade process without proper authentication credentials, the remoting component fails to implement adequate resource limits or validation checks on the incoming handshake parameters. This allows the attacker to send malformed upgrade requests that cause the server to allocate increasingly large amounts of memory for processing each request, ultimately leading to out-of-memory conditions that affect the entire server's ability to service legitimate requests. The vulnerability is particularly dangerous because it requires no authentication credentials and can be exploited over the network, making it a significant threat to operational continuity.
The operational impact of this vulnerability extends beyond simple service disruption, as it represents a critical weakness in the platform's resource management and security architecture. When successful, the attack causes cascading failures throughout the server infrastructure, affecting not just the specific endpoint being targeted but potentially degrading performance across all services running on the same platform instance. The memory exhaustion occurs gradually during the handshake process, making detection difficult and allowing attackers to maintain persistent denial of service conditions without triggering immediate alerts. This vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption" and represents a classic example of how protocol-level flaws can be weaponized for resource exhaustion attacks.
Organizations affected by this vulnerability should implement immediate mitigations including network-level restrictions to block access to the vulnerable ports from untrusted networks, deployment of intrusion detection systems that monitor for suspicious Upgrade header patterns, and implementation of rate limiting mechanisms at the network boundary. The recommended approach involves configuring firewalls to restrict access to ports 8080, 9990, and 4447 to only trusted IP addresses or ranges, while also implementing application-level controls that enforce strict resource limits during handshake operations. Additionally, organizations should consider deploying monitoring solutions that can detect memory usage patterns indicative of this attack vector and establish automated alerting mechanisms to respond quickly when resource consumption spikes occur. This vulnerability demonstrates the importance of proper input validation and resource management in network protocol implementations, and represents a clear example of how attacks against the core communication infrastructure can lead to widespread service degradation.
The attack pattern for this vulnerability follows established methodologies outlined in the ATT&CK framework under the T1499 category for network denial of service attacks. The exploitation process requires minimal technical skill and can be automated using readily available tools, making it particularly dangerous for organizations that do not maintain proper network segmentation or access controls. Security teams should consider implementing comprehensive logging and monitoring solutions that track all Upgrade header negotiations and resource allocation patterns, as this data becomes crucial for both detection and forensic analysis when incidents occur. The vulnerability also highlights the need for regular security assessments of core platform components and the importance of maintaining up-to-date patches that address known issues in third-party libraries such as jboss-remoting.
Mitigation strategies should include immediate patching of affected systems, implementation of network segmentation to isolate vulnerable services, and deployment of web application firewalls that can filter out malicious Upgrade headers. Organizations should also conduct thorough security testing to identify all instances where this vulnerability may exist within their infrastructure, particularly focusing on any systems that expose the specified ports to external networks. The remediation process requires careful coordination between system administrators and security teams to ensure that patch deployment does not disrupt ongoing operations while simultaneously addressing the vulnerability's exposure window. Proper incident response procedures should be established that include identification of the attack pattern, containment of affected services, and verification that the fix has properly addressed the memory exhaustion conditions.