CVE-2026-61772 in Megatron Bridge
Summary
by MITRE • 09/01/2026
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.
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Analysis
by VulDB Data Team • 09/01/2026
The identified security flaw resides within NVIDIA Megatron Bridge, specifically involving the improper handling of serialized objects during data processing operations. This vulnerability is classified as a deserialization of untrusted data issue, which corresponds directly with CWE-502 in the Common Weakness Enumeration standard. The core technical deficiency lies in the application's failure to adequately validate or sanitize input streams before they are processed by internal serialization mechanisms. When an attacker supplies maliciously crafted serialized payloads, the system interprets these inputs as legitimate objects without sufficient verification of their origin or integrity. This lack of rigorous validation allows external actors to inject arbitrary object graphs into the execution environment, bypassing standard security controls that would otherwise prevent such manipulation.
The operational impact of this vulnerability is severe due to its potential for remote code execution and significant data compromise. By exploiting the deserialization flaw, an attacker can manipulate the internal state of the application or trigger specific methods within loaded classes that were not intended for public access. This capability enables the execution of arbitrary commands on the underlying host system with the privileges granted to the Megatron Bridge process. Consequently, this leads to a complete loss of confidentiality, integrity, and availability. Attackers can exfiltrate sensitive configuration data, modify critical model parameters or training states, and potentially establish persistent backdoors within the infrastructure supporting large-scale machine learning workloads.
From an offensive security perspective, this vulnerability aligns with several tactics in the MITRE ATT&CK framework. It is primarily associated with Tactic TA0005 Defense Evasion through Obfuscated Files or Information if the payload is encoded to avoid detection. Furthermore, it falls under Technique T1203 Exploitation for Client Execution and potentially T1059 Command and Scripting Interpreter depending on how the deserialized objects are leveraged to spawn processes. The ability to tamper with data also relates to TA0040 Impact, specifically techniques involving Data Manipulation or Denial of Service if the exploitation causes system instability.
Mitigation strategies must focus on strict input validation and secure coding practices regarding object serialization. Developers should avoid deserializing untrusted data entirely where possible, opting instead for safer data interchange formats such as JSON with schema validation. If legacy compatibility requires Java Object Serialization or similar mechanisms, implementations must employ allow-listing techniques to restrict the types of objects that can be instantiated during the deserialization process. Additionally, integrating runtime application self-protection tools and conducting regular static code analysis scans can help identify unsafe serialization calls before deployment. Regular updates to NVIDIA Megatron Bridge are essential as vendors release patches addressing these specific input validation gaps.