CVE-2026-17401 in API Connect
Summary
by MITRE • 11/07/2026
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to execute arbitrary code due to a stack-based buffer overflow.
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Analysis
by VulDB Data Team • 11/07/2026
The vulnerability identified in IBM API Connect versions ranging from 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 represents a critical security flaw rooted in improper memory management within the application's core processing logic. This specific defect is classified as a stack-based buffer overflow, which occurs when a program writes more data to a fixed-length block of memory on the call stack than it can hold. In this context, the vulnerability allows for arbitrary code execution by an attacker who has already established authenticated access to the system. The presence of authentication requirements indicates that this is not a remote unauthenticated exploit but rather leverages valid credentials or tokens to trigger the malformed input conditions necessary to corrupt the stack memory structure.
From a technical perspective, buffer overflows in network-facing applications often arise when input validation routines fail to adequately check the length of incoming data before copying it into pre-allocated buffers on the stack. When an attacker supplies crafted input that exceeds the expected boundary, the excess data spills over into adjacent memory locations. This overflow can overwrite critical return addresses or function pointers stored on the stack. By carefully crafting this payload, a remote authenticated user can manipulate these overwritten values to redirect program execution flow toward shellcode injected within the buffer itself. This mechanism effectively bypasses standard control-flow integrity checks if additional mitigations such as Stack Canaries are not fully effective against the specific exploitation technique employed.
The operational impact of successfully exploiting this vulnerability is severe, resulting in full compromise of the affected IBM API Connect instance. Since an attacker can execute arbitrary code with the privileges of the application process, they gain the ability to read sensitive configuration files, exfiltrate data processed by the API gateway, install backdoors for persistent access, or pivot further into the internal network infrastructure. Given that API Connect serves as a central hub for managing and securing APIs in enterprise environments, compromising this component can lead to widespread disruption of business-critical services and exposure of protected endpoints. The requirement for authentication limits the attack surface compared to unauthenticated remote code execution vulnerabilities but still poses a significant risk within organizations where insider threats or compromised credentials are prevalent.
This vulnerability aligns with Common Weakness Enumeration (CWE) identifier CWE-120, which describes Buffer Copy without Checking Size of Input, and specifically falls under the sub-category of stack-based buffer overflows. In terms of adversary tactics and techniques, this exploit maps to MITRE ATT&CK technique T1059 Command and Scripting Interpreter, as it enables the execution of arbitrary commands on the target system. Furthermore, the initial access vector relates to T1078 Valid Accounts, highlighting that existing valid credentials are a prerequisite for triggering the flaw. Defense-in-depth strategies must therefore address both the application-level coding errors and the broader identity management practices within the organization.
Mitigation efforts should prioritize immediate patching by upgrading IBM API Connect to versions beyond 10.0.8.12 or 12.1.1.2, where these memory safety issues have been addressed through rigorous input validation and bounds checking implementations. In environments where immediate patching is not feasible due to operational constraints, network segmentation should be enforced to restrict access to the API Connect management plane strictly to trusted administrative subnets. Additionally, deploying Web Application Firewalls with advanced behavioral analysis capabilities may help detect anomalous request patterns indicative of buffer overflow attempts, although such controls are secondary to proper software updates and secure coding practices that eliminate root causes at the source code level.