CVE-2025-26413 is a high-severity vulnerability affecting Apache Kvrocks, a key-value store developed by the Apache Software Foundation. The vulnerability arises from improper input validation (CWE-20) in the implementation of the SETRANGE command. Specifically, the command fails to verify that the 'offset' parameter is a positive integer before using it as an index into a string. This lack of validation allows an attacker to supply an out-of-range index, which causes the server to crash due to an unhandled exception or memory access violation. The affected versions include all releases through 2.11.1. The vulnerability has a CVSS v3.1 base score of 7.5, indicating high severity, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), and impacts availability only (A:H) without affecting confidentiality or integrity. Exploitation results in a denial-of-service (DoS) condition by crashing the Kvrocks server, potentially disrupting applications relying on it for data storage and retrieval. No known exploits are currently reported in the wild. The recommended remediation is to upgrade to version 2.12.0, where the input validation issue has been fixed by enforcing that the offset is a valid positive integer before processing the SETRANGE command.

For European organizations, the impact of this vulnerability primarily manifests as a denial-of-service risk against services using Apache Kvrocks. Kvrocks is often deployed in caching, session management, and real-time data processing scenarios. A successful exploit could cause service interruptions, leading to degraded user experience, operational downtime, and potential financial losses. While the vulnerability does not compromise data confidentiality or integrity, availability disruptions can affect critical business processes, especially in sectors relying on high availability such as finance, telecommunications, and e-commerce. Additionally, repeated or targeted exploitation could be used as part of a larger attack campaign to degrade infrastructure resilience. Organizations with automated or externally accessible Kvrocks instances are at higher risk, as the vulnerability can be triggered remotely without authentication or user interaction.

Beyond the primary recommendation to upgrade to Apache Kvrocks version 2.12.0, European organizations should implement the following specific mitigations: 1) Restrict network access to Kvrocks instances by enforcing strict firewall rules and network segmentation to limit exposure to untrusted networks. 2) Monitor and log SETRANGE command usage to detect anomalous or malformed requests that could indicate exploitation attempts. 3) Employ rate limiting or request throttling on Kvrocks endpoints to reduce the risk of DoS attacks exploiting this vulnerability. 4) Conduct internal audits of applications interacting with Kvrocks to ensure they do not send malformed offset values. 5) Implement automated patch management processes to ensure timely deployment of security updates. 6) Consider deploying application-layer firewalls or intrusion detection systems capable of identifying and blocking malformed commands targeting this vulnerability.