CVE-2026-41566 Overview
CVE-2026-41566 is an Improper Handling of Insufficient Permissions or Privileges vulnerability [CWE-280] in Apache Kvrocks version 2.8.0. Kvrocks is a distributed key-value Network Database Service (NoSQL) that uses the RocksDB storage engine and speaks the Redis protocol. The flaw allows an authenticated low-privileged user to perform actions that should require higher privileges, breaching the access control model. The Apache Kvrocks project recommends upgrading to version 2.16.0, which contains the fix.
Critical Impact
An authenticated attacker with low privileges can exploit improper privilege handling in Apache Kvrocks 2.8.0 to compromise confidentiality, integrity, and availability of the database service.
Affected Products
- Apache Kvrocks 2.8.0
- Deployments running Kvrocks as a Redis-compatible distributed key-value store
- Environments upgraded from earlier 2.x releases that have not moved to 2.16.0
Discovery Timeline
- 2026-06-25 - CVE-2026-41566 published to the National Vulnerability Database (NVD)
- 2026-06-25 - Apache Software Foundation announces the issue on the Apache Thread Discussion mailing list and OpenWall OSS Security Update
- 2026-06-25 - NVD record last modified
Technical Details for CVE-2026-41566
Vulnerability Analysis
The vulnerability stems from improper handling of insufficient permissions or privileges within Apache Kvrocks 2.8.0. Under [CWE-280], the application receives an indication that it lacks the necessary privileges for an operation but proceeds to execute that operation anyway. In Kvrocks, this manifests when the server processes commands without correctly enforcing the Access Control List (ACL) restrictions tied to the authenticated user. An attacker holding a low-privileged account can issue commands that should be denied, gaining read, write, or administrative access to keyspaces and configuration. The scope extends beyond the vulnerable component, allowing the attacker to influence subsystems and clients that trust Kvrocks data.
Root Cause
The root cause is missing or incomplete enforcement of privilege checks in command dispatch paths. When permission evaluation returns an insufficient-privilege result, the code path does not abort the operation and instead continues processing. This makes ACL rules advisory rather than authoritative for affected commands in version 2.8.0.
Attack Vector
The attack vector is network-based. An attacker authenticates to Kvrocks over its Redis-compatible protocol using any valid low-privilege credential. The attacker then issues commands that exceed the granted ACL scope. Successful exploitation requires limited user interaction, as noted by the CVSS vector component UI:P. No verified public exploit code is currently available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-41566
Indicators of Compromise
- Unexpected successful execution of administrative Kvrocks commands by users who hold restricted ACL roles.
- Audit log entries showing privileged operations such as CONFIG, FLUSHALL, DEBUG, or SCRIPT originating from non-admin accounts.
- Sudden changes to namespace tokens, ACL definitions, or replication topology that do not correlate with administrator activity.
Detection Strategies
- Inventory all running Kvrocks instances and confirm their version against 2.8.0. Treat any instance reporting 2.8.0 from the INFO server command as vulnerable.
- Compare each authenticated user's executed commands against their assigned ACL rules and alert on any command outside the allowed set.
- Capture and review the Kvrocks slow log and command log to identify privilege escalation attempts following authentication events.
Monitoring Recommendations
- Forward Kvrocks server logs and operating system audit logs to a centralized analytics platform for correlation with user identity data.
- Establish behavioral baselines for each ACL user and alert on deviations such as new command categories or sudden volume increases.
- Monitor network connections to Kvrocks ports from unexpected source addresses, including internal hosts that do not normally connect.
How to Mitigate CVE-2026-41566
Immediate Actions Required
- Upgrade all Apache Kvrocks 2.8.0 deployments to version 2.16.0 or later, which contains the official fix.
- Rotate all Kvrocks user passwords and ACL tokens after the upgrade to invalidate any credentials that may have been exposed.
- Audit existing ACL definitions and remove unused or overly permissive accounts before resuming production traffic.
Patch Information
Apache Kvrocks 2.16.0 resolves CVE-2026-41566. Refer to the Apache Thread Discussion and the OpenWall OSS Security Update for the official advisory text and upgrade guidance.
Workarounds
- Restrict network access to Kvrocks listeners using firewall rules so only trusted application hosts can connect to the service port.
- Disable or remove low-privileged ACL users that are not strictly required until the upgrade to 2.16.0 is complete.
- Place Kvrocks behind an authenticating proxy or service mesh that enforces command-level allowlists independent of the Kvrocks ACL engine.
# Verify the running Kvrocks version and plan the upgrade to 2.16.0
redis-cli -h <kvrocks-host> -p <port> -a <password> INFO server | grep kvrocks_version
# Example package upgrade flow (adjust to your distribution or container image)
systemctl stop kvrocks
# Replace the binary with the 2.16.0 release artifact, then:
systemctl start kvrocks
redis-cli -h <kvrocks-host> -p <port> -a <password> INFO server | grep kvrocks_version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
