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": "2026-09-01T16:17:09.867Z",
  "pubdate": "2026-09-01T16:17:09.867Z",
  "executiveSummary": "The NVIDIA Megatron Bridge is affected by an insecure deserialization vulnerability, which poses a critical security risk to the integrity, confidentiality, and availability of the host system.\nThis vulnerability allows an unauthenticated or remote attacker to inject malicious, untrusted data into the application's serialization stream. By manipulating the serialized object structure, an attacker can influence the application's internal logic, potentially leading to arbitrary code execution, unauthorized data modification, or the exfiltration of sensitive information.\nThe flaw stems from the improper validation of incoming serialized objects before they are reconstituted by the system. If successful, the exploit grants the attacker the ability to manipulate the runtime state of the application. The impact is significant, as it may result in a total compromise of the host environment depending on the privileges of the service running the bridge.\nOrganizations using the NVIDIA Megatron Bridge should prioritize addressing this vulnerability, as it represents a classic entry point for remote exploitation within data processing pipelines. Risk implications include system-wide compromise, potential lateral movement within the network, and the compromise of proprietary data streams.",
  "technicalDetails": "The vulnerability resides in the object deserialization logic within the NVIDIA Megatron Bridge component. Insecure deserialization occurs when an application takes untrusted or tampered input from an external source and uses it to reconstruct an object without sufficient validation, type checking, or integrity verification. This process essentially trusts the serialized data to represent a valid, safe object state.\nThe root cause is the failure to implement strict class whitelisting or signature verification (such as HMAC) on serialized streams. Because the bridge processes deserialized data, an attacker can craft a malicious serialized payload—often referred to as a 'gadget chain'—that leverages existing, legitimate code blocks (gadgets) within the application or its associated libraries. When the application calls the deserialization method on the malicious payload, these gadgets are executed in sequence during the instantiation of the object.\nThe attack flow follows a structured path: First, the attacker identifies an entry point where serialized data is accepted by the NVIDIA Megatron Bridge, such as an API endpoint, message queue, or inter-process communication (IPC) channel. Second, the attacker generates a malicious serialized object specifically engineered to trigger a specific code path or memory corruption upon reconstruction. Third, the attacker transmits this payload to the target service. Finally, the application, lacking input validation, parses the stream, instantiates the malicious object, and triggers the unintended execution flow.\nExploitation of this vulnerability does not necessarily require prior authentication, depending on the network exposure of the specific interface handling the deserialization. The impact post-exploitation is severe. By redirecting the flow of execution, an attacker can achieve Remote Code Execution (RCE) with the privilege level of the service process. Furthermore, the attacker can perform data tampering by modifying the attributes of reconstructed objects to bypass authorization checks or alter processed data values. Information disclosure is also possible if the gadget chain allows for the reading of arbitrary memory contents or file structures accessible to the application process, potentially exposing credentials or configuration parameters."
}