CVE-2026-16178 in DataPower Gateway
Summary
by MITRE • 10/08/2026
IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, 11.0.0.0 through 11.0.0.2 could allow a remote attacker to cause a denial of service due to improper input validation.
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Analysis
by VulDB Data Team • 10/08/2026
The vulnerability identified in IBM DataPower Gateway versions ranging from 10.5.0.0 through 10.6.6, as well as specific builds within the 11.0.0.x series, represents a critical flaw rooted in improper input validation mechanisms. This security deficiency allows remote attackers to exploit weaknesses in how the gateway processes incoming data streams before they are routed or transformed by backend services. As an enterprise-grade integration platform and API gateway, IBM DataPower Gateway serves as a central choke point for organizational traffic, handling complex protocols such as SOAP, REST, XML, and binary formats like EDI. When input validation is insufficient, the system fails to adequately sanitize or verify the structure, length, or content of requests received from external sources. This lack of rigorous checking creates an opening where malformed or specifically crafted payloads can bypass standard security controls embedded within the gateway configuration.
The technical nature of this flaw centers on the application's inability to correctly handle edge cases in input parsing logic. In many enterprise gateways, complex XML structures or large binary payloads are parsed using memory-intensive processes that allocate resources based on expected sizes and formats. If an attacker submits a request with unexpectedly deep nesting levels, excessively long strings, or malformed encoding sequences, the gateway may enter into an infinite loop, exhaust available memory buffers, or trigger unhandled exceptions within its processing engine. This behavior is characteristic of CWE-20 Improper Input Validation vulnerabilities, where the software does not sufficiently verify that incoming data conforms to expected constraints before proceeding with execution. The absence of robust boundary checks and type enforcement allows malicious actors to manipulate internal state variables in ways that destabilize the service layer responsible for request handling.
The operational impact of this vulnerability is primarily a denial of service against the IBM DataPower Gateway infrastructure itself, which can cascade into broader organizational disruptions. Since these gateways often sit at the perimeter or within critical microservice architectures, their unavailability prevents legitimate users and systems from accessing backend applications through standard API endpoints. An attacker does not necessarily need to inject malicious code or exfiltrate data; simply sending a sequence of carefully crafted requests that trigger resource exhaustion can render the gateway non-responsive for extended periods. This results in significant downtime for dependent services, potential loss of revenue due to interrupted transactions, and increased operational costs associated with incident response and system recovery. The severity is amplified by the fact that DataPower appliances are frequently deployed as single points of failure or critical load balancers within high-availability clusters, meaning their compromise can affect multiple downstream systems simultaneously.
Mitigation strategies for this vulnerability require immediate attention to patch management and configuration hardening. Organizations running affected versions must apply the latest security updates provided by IBM, which typically include code changes that enforce stricter input validation rules and improve resource limits during parsing operations. Until patches are applied, administrators should implement network-level controls such as rate limiting on incoming connections to mitigate the volume of requests processed per second. Additionally, deploying Web Application Firewalls with specific signatures for known exploitation patterns related to XML external entity attacks or buffer overflow attempts can provide an additional layer of defense by blocking malicious payloads before they reach the DataPower appliance. Regular auditing of gateway configurations against industry standards like NIST SP 800-53 and adherence to OWASP API Security Top Ten guidelines will help identify similar weaknesses in input handling across the broader integration landscape, ensuring a more resilient security posture for enterprise communication channels.