CVE-2026-49817 in Command Update
Summary
by MITRE • 08/19/2026
Dell Command Update (DCU), versions prior to 5.7.1, contain a Deserialization of Untrusted Data vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Elevation of Privileges.
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Analysis
by VulDB Data Team • 08/19/2026
The Dell Command Update utility serves as a critical component in enterprise IT infrastructure, responsible for detecting and applying firmware and driver updates across managed systems. Versions prior to 5.7.1 contain a significant security flaw classified under the category of Deserialization of Untrusted Data. This vulnerability arises from the application's failure to properly validate or sanitize data structures before processing them through deserialization routines. In software development, serialization is often used to convert complex objects into a format that can be easily stored or transmitted, while deserialization reverses this process. When an application trusts input data without rigorous validation during this phase, it creates a pathway for attackers to inject malicious payloads disguised as legitimate serialized objects.
The technical nature of this flaw allows a low-privileged attacker with local access on the affected system to exploit the improper handling of these data structures. By crafting specific inputs that trigger unintended behavior within the deserialization logic, an attacker can manipulate the application's execution flow. This manipulation typically involves injecting code or altering object states in ways that bypass standard security controls. The core issue lies in the assumption that incoming data is safe, which contradicts the principle of least trust required for secure software design. Consequently, this oversight enables the execution of arbitrary commands within the context of the application running Dell Command Update.
The operational impact of exploiting this vulnerability is severe due to its potential for Elevation of Privileges. Since system update utilities often run with elevated permissions or have access to sensitive configuration files and firmware repositories, successfully leveraging this flaw allows an attacker to escalate their privileges from a standard user account to that of the system administrator or even higher levels depending on how the utility is configured. This escalation grants the attacker comprehensive control over the affected machine, including the ability to install persistent malware, exfiltrate confidential data, modify security settings, and potentially pivot to other systems within the network if lateral movement capabilities are available.
From a classification perspective, this vulnerability aligns with CWE-502, which describes Deserialization of Untrusted Data, highlighting the risks associated with insecure deserialization practices in modern applications. Furthermore, the exploitation technique maps directly to MITRE ATT&CK techniques related to Privilege Escalation and Command Line Interface abuse, specifically those involving local exploits for privilege escalation. Understanding these mappings is essential for security teams aiming to detect similar patterns or implement appropriate monitoring rules within endpoint detection and response solutions.
To mitigate this risk, organizations must prioritize the immediate update of Dell Command Update to version 5.7.1 or later, where the deserialization logic has been hardened against untrusted inputs. In environments where patching is not immediately feasible, implementing strict application whitelisting can prevent unauthorized execution of modified binaries. Additionally, enforcing least privilege principles by ensuring that standard user accounts do not have write access to directories containing update utilities can reduce the attack surface. Regular auditing of system logs for unusual process creation events associated with Dell Command Update should also be conducted to detect potential exploitation attempts in real time.