CVE-2026-4511: Vanna-AI Vanna RCE Vulnerability

CVE-2026-4511 Overview

A security vulnerability has been detected in vanna-ai vanna up to version 2.0.2. The vulnerability affects the exec function located in the file /src/vanna/legacy. This flaw allows for injection attacks that can be exploited remotely. The exploit has been disclosed publicly and may be used by attackers. The vendor was contacted early about this disclosure but did not respond in any way.

Critical Impact

Remote attackers can exploit the injection vulnerability in the exec function to execute malicious code or commands on systems running affected versions of vanna-ai vanna.

Affected Products

• vanna-ai vanna versions up to 2.0.2
• Systems utilizing the /src/vanna/legacy module
• Applications integrating the vulnerable exec function

Discovery Timeline

• 2026-03-21 - CVE-2026-4511 published to NVD
• 2026-03-23 - Last updated in NVD database

Technical Details for CVE-2026-4511

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as an injection vulnerability. The flaw exists within the exec function of vanna-ai's legacy codebase, which fails to properly sanitize or validate input before processing it in a potentially dangerous context.

The vulnerability can be exploited remotely over the network, requiring low privileges and no user interaction to execute. An attacker leveraging this flaw could achieve limited impact to system confidentiality, integrity, and availability. The public disclosure of this vulnerability, combined with the lack of vendor response, increases the risk of exploitation in the wild.

Root Cause

The root cause of CVE-2026-4511 lies in improper input validation within the exec function in /src/vanna/legacy. The function does not adequately sanitize user-supplied input before using it in operations that interpret special elements, allowing attackers to inject malicious payloads that are executed by the downstream component.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote exploitation. An attacker with low privileges can craft malicious input that, when processed by the vulnerable exec function, results in injection attacks. The attack does not require user interaction and has low complexity to execute.

The vulnerability allows attackers to manipulate the application's behavior by injecting specially crafted payloads through the exec function in the legacy module. For detailed technical information and proof-of-concept details, refer to the GitHub RCE PoC Repository and VulDB entry #352077.

Detection Methods for CVE-2026-4511

Indicators of Compromise

• Unexpected or anomalous calls to the exec function in /src/vanna/legacy with unusual parameters
• Log entries showing injection patterns or special characters in function inputs
• Unusual process spawning or command execution originating from vanna-ai components
• Network connections to suspicious external hosts from systems running vulnerable vanna versions

Detection Strategies

• Implement application-level logging to monitor all calls to the exec function and capture input parameters
• Deploy web application firewalls (WAF) with injection detection rules to identify malicious payloads
• Use static application security testing (SAST) tools to scan codebases for usage of the vulnerable function
• Monitor for behavioral anomalies in systems running vanna-ai vanna versions up to 2.0.2

Monitoring Recommendations

• Configure alerts for injection pattern signatures in application logs
• Monitor network traffic for suspicious outbound connections from vanna-ai application servers
• Implement runtime application self-protection (RASP) to detect and block injection attempts
• Review and audit usage of the /src/vanna/legacy module across all deployments

How to Mitigate CVE-2026-4511

Immediate Actions Required

• Identify all systems running vanna-ai vanna versions up to 2.0.2 and prioritize them for remediation
• Restrict network access to affected systems to reduce the attack surface
• Implement input validation and sanitization as an interim measure if source code access is available
• Consider disabling or isolating the /src/vanna/legacy module if not critical to operations

Patch Information

At the time of publication, the vendor (vanna-ai) was contacted about this vulnerability but did not respond. No official patch has been released. Organizations should monitor the vanna-ai GitHub repository and VulDB entry #352077 for updates regarding a security fix. Consider alternative solutions or fork the project to apply custom fixes if the vulnerability remains unpatched.

Workarounds

• Implement strict input validation on all data passed to the exec function before it reaches the vulnerable code
• Deploy network-level controls such as firewalls and intrusion prevention systems to filter malicious injection payloads
• Use a reverse proxy with injection detection capabilities in front of applications using vanna-ai
• Consider replacing the legacy module with alternative implementations that do not use the vulnerable exec function

# Example: Restrict access to systems running vulnerable vanna-ai versions
# Add firewall rules to limit network exposure (adjust IPs as needed)
iptables -A INPUT -p tcp --dport 8080 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP