CVE-2026-24713: Apache IoTDB Input Validation Flaw

CVE-2026-24713 Overview

CVE-2026-24713 is an improper input validation vulnerability in Apache IoTDB, an open-source time-series database used in industrial IoT and observability deployments. The flaw affects versions 1.0.0 through 1.3.6 and 2.0.0 through 2.0.6. Unauthenticated attackers can exploit the issue over the network with low complexity and no user interaction. The weakness maps to CWE-20: Improper Input Validation and CWE-917: Expression Language Injection, indicating that attacker-controlled input reaches an expression evaluation context. Apache has released fixed versions 1.3.7 and 2.0.7.

Critical Impact

Remote unauthenticated attackers can execute arbitrary expressions against Apache IoTDB, resulting in full compromise of confidentiality, integrity, and availability of the database.

Affected Products

• Apache IoTDB 1.0.0 through 1.3.6
• Apache IoTDB 2.0.0 through 2.0.6
• Deployments exposing IoTDB query interfaces to untrusted networks

Discovery Timeline

• 2026-03-09 - CVE-2026-24713 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-24713

Vulnerability Analysis

The vulnerability stems from how Apache IoTDB processes user-supplied input before passing it to an expression evaluator. The combination of [CWE-20] and [CWE-917] indicates that input arriving from network-facing query interfaces is not sufficiently validated or sanitized before reaching code that interprets expressions. Attackers can craft requests that escape intended parsing boundaries and inject expression syntax interpreted by the server.

Because the attack vector is network-based and requires no authentication or user interaction, any IoTDB instance reachable by an attacker is exposed. Successful exploitation can read or modify time-series data, alter schema metadata, and execute logic in the context of the IoTDB process. Industrial telemetry pipelines, energy monitoring, and observability platforms commonly running IoTDB are within scope.

Root Cause

The root cause is missing or incomplete validation of input that is later evaluated as an expression. Expression Language Injection [CWE-917] occurs when untrusted data is concatenated into or interpreted by an expression engine without strict allowlisting. The fix in versions 1.3.7 and 2.0.7 restricts the inputs accepted by the affected code path.

Attack Vector

An attacker sends a crafted query or API request to an exposed IoTDB endpoint. The payload contains expression syntax that the server evaluates instead of treating as literal data. The result is server-side execution of attacker-controlled logic within the IoTDB runtime. No credentials are required, and exploitation can be automated against internet-exposed instances.

No public proof-of-concept exploit has been published. See the Apache Mailing List Discussion and Openwall OSS Security Update for additional technical context.

Detection Methods for CVE-2026-24713

Indicators of Compromise

• Unexpected outbound network connections originating from the IoTDB server process
• Anomalous query strings containing expression delimiters such as ${, #{, or backtick-bounded payloads
• New or modified files in IoTDB working directories outside of normal operational windows
• IoTDB process spawning child processes such as shells, curl, or wget

Detection Strategies

• Inspect IoTDB audit and query logs for malformed payloads targeting query, schema, or UDF interfaces
• Correlate IoTDB process activity with parent-child process trees to identify unusual command execution
• Apply network signatures on IoTDB RPC and REST ports for expression-injection patterns
• Compare deployed IoTDB binaries against versions 1.3.7 and 2.0.7 to confirm patch status

Monitoring Recommendations

• Forward IoTDB application logs, host telemetry, and network flow data to a central SIEM for correlation
• Alert on authentication failures followed by successful queries from the same source
• Track baselines for query volume and content length to flag injection-style anomalies
• Monitor for new listening sockets or scheduled tasks on hosts running IoTDB

How to Mitigate CVE-2026-24713

Immediate Actions Required

• Upgrade Apache IoTDB to version 1.3.7 or 2.0.7 without delay
• Inventory all IoTDB instances, including embedded and container deployments, and confirm versions
• Restrict network access to IoTDB endpoints using firewalls and security groups
• Review logs for indicators consistent with expression injection prior to the upgrade

Patch Information

Apache has released fixed builds in Apache IoTDB 1.3.7 for the 1.x branch and 2.0.7 for the 2.x branch. Upgrade instructions and release notes are available through the Apache Mailing List Discussion and the Openwall OSS Security Update. No vendor-supplied configuration workaround has been published.

Workarounds

• Block external access to IoTDB query ports until patching is complete
• Place IoTDB behind an authenticating reverse proxy that filters expression metacharacters
• Enable authentication and apply least-privilege roles to all IoTDB users and service accounts
• Run IoTDB under a dedicated, unprivileged service account to limit post-exploitation impact

# Verify installed Apache IoTDB version
./sbin/start-cli.sh -h 127.0.0.1 -p 6667 -e "show version"

# Restrict IoTDB RPC port to trusted management subnet (Linux iptables example)
iptables -A INPUT -p tcp --dport 6667 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 6667 -j DROP