NVIDIA NeMo and Megatron RCE Vulnerabilities

Multiple vulnerabilities have been identified in NVIDIA Megatron Bridge and NVIDIA NeMo Framework. The flaws include code injection and remote code execution (RCE) issues that could allow attackers to execute arbitrary code, escalate privileges, cause denial of service, disclose sensitive information, or tamper with data. There are currently no reports of active exploitation.

CVE

CVE-2025-33239
CVE-2025-33240
CVE-2025-33236
CVE-2025-33241–CVE-2025-33253

Targeting / Delivery Mechanism

Megatron Bridge: Exploitable via malicious input within data merging and data shuffling tutorials.
NeMo Framework: Triggered by crafted configuration parameters, malicious data inputs, or loading specially crafted files, including in distributed environments.

User interaction such as loading malicious files or processing untrusted data increases risk.

Execution Technique

Code injection through improper input validation.
Command injection via crafted configuration parameters.
Remote code execution through maliciously crafted files or data inputs.
Vulnerabilities present in utilities such as ASR Evaluator and voice preprocessing scripts.

Persistence / Deployment

Successful exploitation may allow attackers to execute arbitrary code within AI/ML environments, escalate privileges, tamper with model data, manipulate outputs, or deploy further payloads. Distributed training environments may increase lateral movement risk.

Impact and Smarttech247's Recommended Actions

Operational Impact

Severity ranges from High (CVSS up to 8.0). Exploitation could compromise AI development pipelines, training environments, or production ML systems, leading to integrity loss and potential broader infrastructure compromise.

Validate Integrity

Identify deployments of:

NVIDIA Megatron Bridge versions prior to 0.2.2
NVIDIA NeMo Framework versions prior to 2.6.1

Review logs for suspicious execution activity, unexpected configuration changes, or anomalous distributed training behaviour.

Respond to Confirmed Compromise

Isolate affected systems and review recent file loads, configuration changes, and executed scripts. Rebuild environments if integrity cannot be confirmed. Rotate credentials associated with affected systems.

Strengthen Preventative Controls