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": "2026-09-01T16:17:10.210Z",
  "pubdate": "2026-09-01T16:17:10.210Z",
  "executiveSummary": "The NVIDIA Megatron Bridge contains a critical vulnerability stemming from the insecure deserialization of untrusted data.\nThis flaw allows a remote, unauthenticated attacker to manipulate serialized objects processed by the application, potentially leading to arbitrary code execution, unauthorized data modification, and sensitive information disclosure.\nThe vulnerability resides within the data handling mechanisms of the Bridge component, which fails to properly validate or sanitize incoming serialized payloads.\nBy crafting a malicious serialized object, an attacker can trigger unexpected behavior during the reconstruction of objects in memory, bypassing standard security controls.\nThe risk implication is severe, as successful exploitation grants the attacker the ability to execute arbitrary commands with the privileges of the underlying application process.\nThe exploitation requirement is limited to the ability to supply crafted input to the affected interface, making it a high-priority concern for systems utilizing the NVIDIA Megatron Bridge in network-accessible environments.",
  "technicalDetails": "The vulnerability originates from the improper implementation of object deserialization within the NVIDIA Megatron Bridge. In many serialization frameworks, the process of converting a stream of bytes back into an object involves executing logic defined by the class metadata contained within the serialized payload. If the application does not strictly enforce type checking or validation before initiating this process, an attacker can inject malicious payloads.\nThe attack flow begins when an attacker identifies an endpoint or interface within the NVIDIA Megatron Bridge that accepts serialized data as input. The attacker then constructs a 'gadget chain'—a sequence of existing code components within the application's classpath that, when invoked during the deserialization process, perform unintended actions. By manipulating the object graph, the attacker directs the application's logic flow to execute functions that were not intended to be reachable via that interface.\nUpon transmission of the malicious payload, the application's deserializer parses the incoming byte stream. As it reconstructs the object, it triggers the 'readObject' or equivalent deserialization hooks. This execution context allows the payload to influence the internal state of the application or invoke arbitrary system calls. Because this process often occurs before the object has been fully instantiated or validated, traditional input sanitization routines are bypassed.\nThe impact of a successful exploit is comprehensive. Arbitrary code execution occurs when the gadget chain invokes process creation primitives or memory manipulation functions, effectively granting the attacker a foothold on the host system. Data tampering occurs as the attacker modifies the internal memory state of the object, which may be subsequently persisted to databases or used in further application logic. Information disclosure is facilitated by exploiting object fields to force the application to return sensitive data back to the attacker during the deserialization process or through secondary side-channel responses.\nThis vulnerability is particularly dangerous because it does not require prior authentication or privileged access to trigger, assuming the vulnerable interface is reachable. The lack of integrity verification on the serialized input ensures that any maliciously crafted stream will be processed as legitimate data by the vulnerable component."
}