CVE-2025-33240: NVIDIA Megatron Bridge RCE Vulnerability

CVE-2025-33240 Overview

CVE-2025-33240 is a code injection vulnerability identified in NVIDIA Megatron Bridge, specifically within a data shuffling tutorial component. The vulnerability allows attackers who can provide malicious input to inject and execute arbitrary code. A successful exploit of this vulnerability could lead to code execution, privilege escalation, information disclosure, and data tampering on affected systems.

Critical Impact

This vulnerability enables code injection through malicious input in NVIDIA Megatron Bridge's data shuffling tutorial, potentially allowing attackers to execute arbitrary code, escalate privileges, access sensitive information, and tamper with data on compromised systems.

Affected Products

• NVIDIA Megatron Bridge (specific versions not disclosed in advisory)

Discovery Timeline

• 2026-02-18 - CVE-2025-33240 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2025-33240

Vulnerability Analysis

This vulnerability falls under CWE-94 (Improper Control of Generation of Code, also known as 'Code Injection'). The flaw exists within a data shuffling tutorial component of NVIDIA Megatron Bridge, where user-supplied input is not properly sanitized before being processed. This improper input handling allows an attacker to inject malicious code that gets executed in the context of the application.

Code injection vulnerabilities occur when an application incorporates untrusted data into a code segment without proper validation or encoding. In this case, the data shuffling tutorial accepts input that can be crafted to include executable code, which is then processed by the application's interpreter or execution engine.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the data shuffling tutorial functionality. The application fails to properly neutralize special characters or code constructs that could be interpreted as executable instructions. This allows attackers to embed malicious code within what should be benign data input, resulting in code injection when the input is processed.

Attack Vector

The attack requires local access to the system where NVIDIA Megatron Bridge is installed. An attacker with low privileges on the local system can craft malicious input specifically designed to exploit the data shuffling tutorial's lack of input validation. When this malicious input is processed, the injected code executes with the privileges of the application, potentially allowing the attacker to:

• Execute arbitrary code on the target system
• Escalate privileges to gain elevated access
• Access and exfiltrate sensitive information
• Modify or corrupt data within the application's scope

The vulnerability mechanism involves providing specially crafted input to the data shuffling tutorial that contains embedded code constructs. Due to insufficient sanitization, these constructs are interpreted and executed rather than being treated as data. For detailed technical information, refer to the NVIDIA Support Answer.

Detection Methods for CVE-2025-33240

Indicators of Compromise

• Unusual process spawning or execution patterns associated with NVIDIA Megatron Bridge components
• Unexpected system calls or file access from the data shuffling tutorial process
• Anomalous network connections initiated by Megatron Bridge processes
• Signs of privilege escalation attempts following Megatron Bridge execution

Detection Strategies

• Monitor for suspicious command execution patterns originating from NVIDIA Megatron Bridge processes
• Implement application-level logging to capture all input processed by the data shuffling tutorial
• Deploy endpoint detection and response (EDR) solutions to identify code injection attempts
• Use behavioral analysis to detect anomalous execution flows within Megatron Bridge components

Monitoring Recommendations

• Enable verbose logging for NVIDIA Megatron Bridge applications to capture detailed execution traces
• Monitor system logs for unexpected child processes spawned by Megatron Bridge
• Implement file integrity monitoring on Megatron Bridge installation directories
• Configure alerts for any privilege escalation events following Megatron Bridge activity

How to Mitigate CVE-2025-33240

Immediate Actions Required

• Review and restrict access to systems running NVIDIA Megatron Bridge to trusted users only
• Limit the use of affected data shuffling tutorial functionality until patches are applied
• Implement strict input validation at the application boundary where possible
• Monitor affected systems for signs of exploitation

Patch Information

NVIDIA has released security guidance for this vulnerability. Administrators should consult the NVIDIA Support Answer for the latest patch information and remediation steps. Apply vendor-provided updates as soon as they become available to address this code injection vulnerability.

Workarounds

• Restrict local access to systems running NVIDIA Megatron Bridge to only trusted and authenticated users
• Disable or limit access to the data shuffling tutorial component if it is not essential for operations
• Implement additional input validation and sanitization at the application boundary
• Use application sandboxing or containerization to limit the impact of potential exploitation

# Example: Restrict access to Megatron Bridge components
# Limit directory permissions to authorized users only
chmod 750 /path/to/megatron-bridge/tutorials/
chown root:megatron-admins /path/to/megatron-bridge/tutorials/

# Review current user access
getfacl /path/to/megatron-bridge/tutorials/