Description

NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserialization of untrusted data. A successful exploit of this vulnerability might lead to code execution, data tampering, and information disclosure.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-09-01T16:17:12.697Z",
  "pubdate": "2026-09-01T16:17:12.697Z",
  "executiveSummary": "A deserialization of untrusted data vulnerability exists within the NVIDIA Megatron Bridge component.\nThis security flaw allows an unauthenticated or authenticated attacker to supply malicious serialized objects, which the application subsequently deserializes without sufficient validation.\nThe successful exploitation of this vulnerability can lead to remote code execution (RCE), unauthorized data tampering, and the compromise of sensitive information residing within the affected environment.\nThe vulnerability poses a critical risk to system integrity and confidentiality, as it facilitates arbitrary command execution in the context of the application process.\nAttackers can leverage this flaw to gain persistence, escalate privileges, or exfiltrate proprietary data from the host system.\nOrganizations utilizing NVIDIA Megatron Bridge should prioritize remediation to mitigate the threat of unauthorized system access and potential full-system compromise.",
  "technicalDetails": "The vulnerability originates from the improper handling of serialized data objects within the NVIDIA Megatron Bridge component. Deserialization is the process of reconstructing an object from a stream of bytes; when an application performs this operation on untrusted input without applying strict integrity checks or type validation, it becomes susceptible to object injection attacks.\nThe root cause lies in the application's reliance on native deserialization libraries that instantiate complex objects based on the metadata contained within the serialized stream. An attacker can craft a malicious serialized payload—often referred to as a gadget chain—that leverages classes present in the application's classpath to execute unintended code paths during the object reconstruction process.\nThe attack flow begins when the attacker identifies an entry point where the application accepts serialized data. By injecting a specially crafted byte stream into this endpoint, the attacker influences the deserialization routine. Upon invocation of the deserialization method, the underlying library reconstructs the malicious object graph. During this phase, the application may automatically trigger methods such as readObject(), finalize(), or other magic methods that execute the attacker’s malicious instructions.\nBecause these objects are instantiated within the memory space of the NVIDIA Megatron Bridge process, the malicious payload executes with the same privileges and permissions as the application itself. This effectively bypasses standard authorization controls, as the execution occurs as a direct result of the deserialization process rather than through standard API interaction. The payload behavior can range from executing system commands via OS command injection, performing file system operations, or creating a reverse shell to establish long-term unauthorized access.\nPost-exploitation impact is severe, as the attacker gains the ability to manipulate data structures, tamper with application logic, or extract credentials and sensitive information exposed in memory. In scenarios where the application runs with elevated privileges, the attacker may pivot to internal network resources or gain complete control over the underlying infrastructure, depending on the environment's security posture and system isolation."
}