CVE-2026-24816: Datavane TIS Infinite Loop DoS Vulnerability

CVE-2026-24816 Overview

CVE-2026-24816 is a Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability affecting datavane tis, specifically within the tis-console module. The vulnerability is associated with the ChangeDomainAction.Java program file located in tis-console/src/main/java/com/qlangtech/tis/runtime/module/action. This flaw allows remote attackers to trigger an infinite loop condition, potentially leading to denial of service through resource exhaustion.

Critical Impact

This vulnerability enables unauthenticated remote attackers to cause complete denial of service by exploiting an infinite loop condition in the ChangeDomainAction module, potentially affecting system availability and consuming critical CPU resources.

Affected Products

• datavane tis versions before v4.3.0
• tis-console module (specifically ChangeDomainAction.Java)
• Systems running vulnerable tis-console/src/main/java/com/qlangtech/tis/runtime/module/action modules

Discovery Timeline

• 2026-01-27 - CVE CVE-2026-24816 published to NVD
• 2026-01-27 - Last updated in NVD database

Technical Details for CVE-2026-24816

Vulnerability Analysis

This vulnerability falls under CWE-835 (Loop with Unreachable Exit Condition), commonly known as an infinite loop vulnerability. The flaw exists in the ChangeDomainAction.Java file within the tis-console module. When exploited, the vulnerable code path enters a loop that lacks proper exit conditions, causing the affected thread or process to consume CPU resources indefinitely.

The vulnerability is accessible over the network without requiring authentication or user interaction, making it particularly dangerous for internet-facing deployments. An attacker can remotely trigger the infinite loop, causing the application to become unresponsive and potentially affecting other services on the same host due to resource exhaustion.

Root Cause

The root cause of this vulnerability is a programming error in ChangeDomainAction.Java where a loop construct does not have a reachable exit condition under certain input conditions. This type of flaw typically occurs when:

• Loop termination conditions depend on external input that may not change
• Break conditions rely on state that cannot be modified within the loop
• Edge cases in input validation allow the loop to continue indefinitely

The fix, available in version 4.3.0 and later, addresses the loop condition to ensure proper termination under all circumstances.

Attack Vector

The attack vector for this vulnerability is network-based. An attacker can exploit this vulnerability remotely by sending specially crafted requests to the tis-console module that trigger the vulnerable code path in ChangeDomainAction.Java. The attack does not require any privileges or user interaction, making it straightforward to exploit.

The exploitation flow involves:

1. Identifying an exposed tis-console instance
2. Crafting a request that reaches the vulnerable ChangeDomainAction handler
3. Triggering the infinite loop condition through specific input parameters
4. The server thread becomes stuck in the loop, consuming CPU resources

For technical details on the vulnerability and its fix, refer to the GitHub Pull Request Discussion.

Detection Methods for CVE-2026-24816

Indicators of Compromise

• Abnormally high CPU utilization by the tis-console Java process
• Unresponsive tis-console web interface or API endpoints
• Stuck threads in Java thread dumps showing ChangeDomainAction in the call stack
• Increasing memory consumption as threads accumulate

Detection Strategies

• Monitor Java application server thread pools for threads stuck in ChangeDomainAction methods
• Implement request timeout monitoring to detect requests that exceed normal processing times
• Configure application performance monitoring (APM) tools to alert on CPU spikes in the tis-console process
• Review access logs for unusual request patterns targeting domain-related endpoints

Monitoring Recommendations

• Set up alerting for CPU utilization thresholds on systems running datavane tis
• Implement health check endpoints with appropriate timeouts to detect unresponsive instances
• Configure log aggregation to capture and analyze request patterns to the tis-console module
• Deploy SentinelOne to detect and respond to denial-of-service attack patterns

How to Mitigate CVE-2026-24816

Immediate Actions Required

• Upgrade datavane tis to version v4.3.0 or later immediately
• Review network exposure of tis-console instances and restrict access where possible
• Implement request timeouts at the load balancer or reverse proxy level
• Monitor CPU utilization on affected systems for signs of exploitation

Patch Information

The vulnerability has been addressed in datavane tis version v4.3.0. Organizations should upgrade to this version or later to remediate the vulnerability. Detailed information about the fix can be found in the GitHub Pull Request #444.

Workarounds

• Place tis-console behind a reverse proxy with request timeout enforcement
• Implement rate limiting on endpoints associated with domain actions
• Restrict network access to tis-console to trusted IP ranges only
• Deploy web application firewall (WAF) rules to detect and block suspicious request patterns

# Example nginx timeout configuration for tis-console proxy
location /tis-console/ {
    proxy_pass http://tis-backend;
    proxy_connect_timeout 30s;
    proxy_send_timeout 60s;
    proxy_read_timeout 60s;
    # Limit request rate to prevent DoS attempts
    limit_req zone=tis_limit burst=10 nodelay;
}