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": "2026-09-01T16:17:10.320Z",
  "pubdate": "2026-09-01T16:17:10.320Z",
  "executiveSummary": "The NVIDIA Megatron Bridge is affected by a deserialization of untrusted data vulnerability. This security flaw stems from the improper handling of serialized objects, allowing an unauthenticated remote attacker to supply maliciously crafted data that is processed by the application's deserialization logic. Successful exploitation of this vulnerability can lead to critical security compromises, including arbitrary code execution (ACE), unauthorized data tampering, and the disclosure of sensitive information residing within the application's memory space. The vulnerability poses a significant risk to the integrity, confidentiality, and availability of affected systems. By injecting structured malicious payloads, an attacker can manipulate the internal state of the application, potentially leading to a full system compromise. The vulnerability does not necessarily require high-level privileges if the endpoint is exposed, as the deserialization process typically executes with the permissions of the underlying service.",
  "technicalDetails": "The vulnerability resides within the deserialization mechanism of the NVIDIA Megatron Bridge, which fails to adequately validate or sanitize incoming data streams before reconstructing them into application objects. Deserialization is a process where a stream of bytes is converted back into an object; if the application does not employ secure deserialization patterns or verify the integrity of the incoming data, it becomes susceptible to object injection attacks.\nThe root cause of this vulnerability is the trust placed in serialized objects transmitted via the network or through other input vectors. When an attacker supplies a crafted payload—such as a serialized object graph designed to instantiate 'gadget chains'—the application's deserializer automatically invokes class methods and constructors during the reconstruction process. This allows for the execution of arbitrary code within the context of the application's runtime environment.\nThe attack flow proceeds as follows: First, the attacker identifies an endpoint or communication channel that utilizes the vulnerable deserialization routine. Second, the attacker constructs a malicious payload containing the serialized object graph. This payload is engineered to leverage existing code paths (gadgets) within the application or its imported libraries to achieve a desired outcome. Third, the attacker transmits this payload to the target component. Fourth, the Megatron Bridge deserializes the data, inadvertently triggering the execution of the attacker's payload. Because the deserialization occurs before any security context is fully validated, the payload executes with the same privileges as the parent process.\nExploitation allows an attacker to bypass standard security controls, as the execution occurs in-memory, often leaving minimal traces on disk. The impact of successful exploitation is severe: code execution grants the attacker full control over the process, allowing for the installation of backdoors, further lateral movement within the network, or the extraction of credentials and sensitive data. Furthermore, data tampering can lead to the corruption of business logic or the injection of false information into the application's state, while information disclosure can lead to the exfiltration of sensitive internal memory contents."
}