EUVD-2026-62503
GHSA-wv8r-q48p-5xpr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack vector and low privilege requirement confirmed by description; full C/I/A impact reflects complete privilege escalation to elevated context with no scope change.
Primary rating from Vendor (dell).
CVSS VectorVendor: dell
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Elevation of privilege in Dell Command Update (DCU) versions prior to 5.7.1 enables a low-privileged local attacker to fully compromise system confidentiality, integrity, and availability through unsafe deserialization of attacker-controlled data. The root cause is CWE-502 (Deserialization of Untrusted Data), a class of vulnerability where malicious serialized objects can trigger unintended code paths during deserialization, resulting in privilege escalation on Dell client endpoints. Dell has released version 5.7.1 as a fix per advisory DSA-2026-309; no public exploit or active exploitation has been identified at time of analysis.
Technical ContextAI
Dell Command Update (DCU) is a Windows-based application pre-installed on Dell client systems (laptops and desktops) that automates the discovery and installation of driver, firmware, and software updates. The affected product is identified by CPE cpe:2.3:a:dell:dell_command_update_(dcu):*:*:*:*:*:*:*:* covering all versions prior to 5.7.1. The root cause is CWE-502 (Deserialization of Untrusted Data): when an application deserializes data without sufficient type or integrity validation, an attacker can craft a malicious serialized object whose deserialization triggers execution of arbitrary code within the application's runtime context. In .NET and Java ecosystems this commonly involves gadget chains that invoke system calls during object reconstruction. Because DCU typically runs with elevated privileges to apply system-level updates, a low-privileged attacker who can inject a malicious payload into the deserialization pipeline can leverage the application's higher-privilege context to escalate their own access.
RemediationAI
The primary remediation is to upgrade Dell Command Update (DCU) to version 5.7.1 or later, as confirmed by Dell advisory DSA-2026-309 at https://www.dell.com/support/kbdoc/en-us/000501378/dsa-2026-309-security-update-for-dell-command-update-for-multiple-vulnerabilities. Organizations managing Dell client fleets should prioritize deployment of this update through their endpoint management tooling (SCCM, Intune, or Dell's own SupportAssist for Business). If immediate patching is not feasible, restrict local interactive logon rights on sensitive systems to further limit the low-privileged attacker prerequisite; however, this does not eliminate the risk for systems with multiple user accounts or where initial access has already been achieved. Uninstalling DCU on systems where automated update functionality is not operationally required is a viable compensating control with the trade-off of requiring manual driver and firmware management. No vendor-documented workaround short of patching has been identified in the advisory.
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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