CVE-2026-59562: Apache IoTDB Authentication Bypass Flaw

CVE-2026-59562 Overview

CVE-2026-59562 is a missing authentication for critical function vulnerability [CWE-306] in Apache IoTDB. The flaw affects Apache IoTDB versions from 2.0.0 before 2.0.11. An attacker can invoke a critical function without providing authentication credentials, bypassing the access controls intended to restrict sensitive operations. The Apache IoTDB project has released version 2.0.11 to address the issue, and users are advised to upgrade.

Critical Impact

Unauthenticated attackers with network reach to a vulnerable Apache IoTDB deployment can invoke a protected function without supplying credentials, undermining the database's authentication boundary.

Affected Products

• Apache IoTDB 2.0.0 through 2.0.10
• Apache IoTDB clusters deployed with default authentication-enabled configurations in the affected range
• Downstream applications and services that embed or depend on Apache IoTDB 2.0.x prior to 2.0.11

Discovery Timeline

• 2026-10-21 - CVE-2026-59562 published to NVD
• 2026-10-22 - Last updated in NVD database

Technical Details for CVE-2026-59562

Vulnerability Analysis

Apache IoTDB is an open-source time-series database used in Internet of Things (IoT) workloads for high-throughput ingestion, storage, and query of sensor data. CVE-2026-59562 is categorized under CWE-306: Missing Authentication for Critical Function. The database exposes a function that performs a security-relevant operation but does not require the caller to present valid credentials. An attacker who can reach the exposed service over the network can invoke the function directly. The Apache security team has not published exploitation details beyond the advisory text.

Root Cause

The root cause is an absent authentication check on a critical function path in Apache IoTDB 2.0.0 through 2.0.10. The function is reachable without the credential validation that governs other sensitive operations. Refer to the Apache Mailing List Thread and the OpenWall OSS Security Update for upstream details.

Attack Vector

Exploitation requires network access to an affected Apache IoTDB endpoint. The attacker sends a request that invokes the vulnerable function without authentication. Because the authentication layer does not gate the function, the request is processed as if it were authorized. No prior privileges or user interaction are required. The upstream advisory does not disclose a proof-of-concept, and no public exploit code is tracked in Exploit-DB at the time of writing.

Detection Methods for CVE-2026-59562

Indicators of Compromise

• Unexpected administrative or configuration-change events in Apache IoTDB audit logs that lack an associated authenticated user context.
• Requests to IoTDB service endpoints originating from IP addresses outside documented operator or application ranges.
• Anomalous spikes in requests to IoTDB RPC or REST endpoints without preceding authentication exchanges.

Detection Strategies

• Review Apache IoTDB server logs for invocations of sensitive functions that are not preceded by a successful authentication event.
• Compare the running IoTDB version against 2.0.11 across all hosts using software inventory tooling.
• Correlate network flow telemetry with IoTDB authentication logs to identify sessions that invoked server functions without a prior login.

Monitoring Recommendations

• Forward Apache IoTDB access and audit logs to a centralized analytics platform and alert on function invocations missing user attribution.
• Monitor for new or unexpected inbound connections to IoTDB listener ports from untrusted network segments.
• Track configuration drift on IoTDB nodes, including changes to iotdb-common.properties authentication settings.

How to Mitigate CVE-2026-59562

Immediate Actions Required

• Upgrade all Apache IoTDB instances in the 2.0.x line to version 2.0.11 as recommended by the Apache project.
• Restrict network access to IoTDB service ports to trusted application subnets using firewalls or security groups.
• Rotate administrative credentials and audit user accounts on affected IoTDB clusters after upgrading.

Patch Information

Apache has released Apache IoTDB 2.0.11, which fixes the missing authentication check. Operators running any version from 2.0.0 through 2.0.10 should upgrade. Patch details are referenced in the Apache Mailing List Thread and the OpenWall OSS Security Update.

Workarounds

• Place vulnerable IoTDB instances behind a network segmentation boundary that denies untrusted traffic until the upgrade is complete.
• Disable or firewall off any IoTDB service interfaces that are not required by production applications.
• Enforce mutual TLS or VPN access at the network layer so that only authenticated infrastructure can reach the IoTDB RPC endpoints.

# Configuration example: restrict IoTDB RPC port to trusted subnet
# Replace 10.0.0.0/24 with your application subnet and 6667 with the configured RPC port
iptables -A INPUT -p tcp --dport 6667 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 6667 -j DROP