CVE-2026-1188 is a buffer overflow vulnerability identified in the Eclipse OMR port library component, specifically in an API function responsible for returning textual names of all supported processor features. Since release 0.2.0, this function failed to correctly calculate the buffer size needed to store the output string because it did not account for the separators inserted between processor feature names. When the supplied output buffer is sized without considering these separators, writing the feature names can overflow the buffer boundary, leading to memory corruption. This vulnerability is classified under CWE-131 (Incorrect Calculation of Buffer Size). The flaw can be triggered remotely without requiring authentication or user interaction, increasing its risk profile. The CVSS v4.0 base score is 6.9 (medium severity), reflecting network attack vector, low complexity, no privileges or user interaction needed, and limited impact on confidentiality, integrity, and availability. The issue was addressed and fixed in Eclipse OMR version 0.8.0 by correcting the buffer size calculation logic to include separators. No public exploits or active exploitation campaigns have been reported to date. However, given the nature of buffer overflows, successful exploitation could lead to application crashes or potentially arbitrary code execution depending on the context in which the vulnerable function is used. Eclipse OMR is a foundational component used in various runtime environments and development tools, making this vulnerability relevant to organizations embedding or relying on this library.

For European organizations, the impact of CVE-2026-1188 depends on the extent to which Eclipse OMR is integrated into their software stacks or development environments. Buffer overflow vulnerabilities can lead to memory corruption, causing application crashes or enabling attackers to execute arbitrary code, which could compromise system integrity and availability. In critical infrastructure or enterprise environments using Eclipse OMR, exploitation could disrupt services or provide attackers a foothold for further lateral movement. The vulnerability’s network accessibility and lack of authentication requirements increase the risk of remote exploitation. Although no known exploits exist currently, the medium severity rating suggests a moderate risk that could escalate if exploit code is developed. Organizations involved in software development, cloud services, or embedded systems using Eclipse OMR should consider this vulnerability a potential threat to operational stability and security. Failure to patch could expose European entities to targeted attacks, especially those in sectors with high reliance on open-source runtime components.

European organizations should immediately assess their use of Eclipse OMR and identify any deployments of versions 0.2.0 through prior to 0.8.0. The primary mitigation is to upgrade to Eclipse OMR version 0.8.0 or later, where the buffer size calculation issue has been fixed. If upgrading is not immediately feasible, organizations should audit and restrict access to services or applications using the vulnerable library to trusted networks only, minimizing exposure to remote attackers. Developers should review any custom code interfacing with the affected API to ensure buffer sizes are correctly calculated, including separators, to prevent overflow. Employing runtime protections such as Address Space Layout Randomization (ASLR), Data Execution Prevention (DEP), and stack canaries can help mitigate exploitation impact. Monitoring logs for abnormal crashes or memory errors related to Eclipse OMR components can provide early detection of exploitation attempts. Finally, organizations should maintain an inventory of open-source components and apply timely patches to reduce exposure to such vulnerabilities.