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": "2026-09-01T16:17:08.593Z",
  "pubdate": "2026-09-01T16:17:08.593Z",
  "executiveSummary": "The NVIDIA Megatron Bridge is affected by a critical deserialization vulnerability involving the processing of untrusted data.\nThis flaw allows a remote or local attacker to manipulate serialized objects, leading to arbitrary code execution, unauthorized data tampering, and sensitive information disclosure.\nThe vulnerability resides within the deserialization logic of the product, where incoming data streams are processed without adequate validation or integrity checks.\nSuccessful exploitation compromises the confidentiality, integrity, and availability of the affected system.\nAttackers can leverage this vulnerability to gain unauthorized control over the execution environment, potentially elevating privileges or accessing restricted system memory and data resources.\nThere are no specific requirements for authentication listed, suggesting the potential for unauthenticated exploitation depending on the network exposure of the interface handling the serialized input.\nOrganizations deploying NVIDIA Megatron Bridge are at significant risk if exposed to untrusted input sources, as this vulnerability provides a direct vector for remote command injection and persistent system compromise.",
  "technicalDetails": "The vulnerability stems from the improper handling of serialized objects within the NVIDIA Megatron Bridge codebase. In many software environments, deserialization is the process of converting a data stream—often transmitted over network protocols or read from files—back into an object instance. When an application deserializes untrusted data without implementing strict type validation or cryptographic signing, it creates a potential attack surface.\nThe root cause is the reliance on insecure deserialization mechanisms that instantiate objects based on metadata contained within the serialized stream. An attacker can craft a malicious payload containing serialized data that triggers unintended code paths or object instantiations upon being parsed by the application's deserialization routine. By embedding 'gadget chains'—existing code constructs within the application or its dependencies—the attacker can redirect the application's execution flow to arbitrary memory addresses.\nThe attack flow typically initiates when an attacker sends a crafted object to the vulnerable service or function. Upon reception, the system attempts to reconstruct the object, executing the logic embedded within the serialized payload. Because the input is not validated, the application trustfully restores the malicious object state, which can include overwriting application variables, modifying function pointers, or triggering constructors that execute system-level commands.\nThe impact of this deserialization flaw is severe, as it bypasses standard security controls. Once the payload is executed in the context of the application process, the attacker inherits the privileges of that process. This allows for post-exploitation activities such as executing system shells, deploying backdoors, or exfiltrating sensitive data stored within the bridge's memory space or accessible file paths.\nFurthermore, data tampering occurs if the attacker successfully modifies serialized objects that control business logic or authentication states. By manipulating these objects before they are processed, an attacker can bypass access control checks or alter configuration parameters to further weaken the system's security posture.\nBecause the vulnerability involves the fundamental way the product handles data objects, the exposure is dependent on the network accessibility of the affected component. If the service is exposed to an untrusted network, an unauthenticated attacker could potentially trigger the payload remotely. The absence of strict input sanitization during the object reconstruction phase ensures that the system remains vulnerable to any actor capable of delivering the malicious serialization stream."
}