CVE-2026-56085: Dell Data Domain Information Disclosure

CVE-2026-56085 Overview

CVE-2026-56085 is an uninitialized resource vulnerability [CWE-908] affecting Dell PowerProtect Data Domain across multiple release trains. The flaw exists in the Dell Data Domain Operating System and could allow a low-privileged local attacker to access sensitive information residing in uninitialized memory or resources. Dell disclosed the issue in security advisory DSA-2026-278.

Affected releases include Data Domain 7.7.1.0 through 8.7, LTS2026 versions 8.6.1.0 through 8.6.1.10, LTS2025 versions 8.3.1.0 through 8.3.1.30, and LTS2024 versions 7.13.1.0 through 7.13.1.70. Exploitation requires local access and authenticated privileges, limiting the practical attack surface.

Critical Impact
A local, low-privileged attacker can read uninitialized data on Dell PowerProtect Data Domain systems, resulting in information exposure limited to confidentiality (CVSS 3.3).

Affected Products

Dell PowerProtect Data Domain OS versions 7.7.1.0 through 8.7
Dell PowerProtect Data Domain LTS2026 versions 8.6.1.0 through 8.6.1.10 and LTS2025 versions 8.3.1.0 through 8.3.1.30
Dell PowerProtect Data Domain LTS2024 versions 7.13.1.0 through 7.13.1.70

Discovery Timeline

2026-07-03 - CVE-2026-56085 published to the National Vulnerability Database
2026-07-08 - Last updated in NVD database

Technical Details for CVE-2026-56085

Vulnerability Analysis

The vulnerability is classified as Use of Uninitialized Resource [CWE-908]. Software that reads or acts on a resource before it has been properly initialized may expose residual data from prior operations. In the Data Domain Operating System, that residual data could contain fragments of memory, configuration state, or other information a low-privileged local user should not observe.

The attack vector is local, meaning the attacker must already possess valid credentials on the appliance to invoke the vulnerable code path. The scope is unchanged, and only confidentiality is impacted — integrity and availability of the appliance remain unaffected. The EPSS probability is 0.095%, indicating a low likelihood of exploitation activity in the near term.

No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is failure to fully initialize a memory buffer or resource before it is used or returned to a caller. When an unprivileged local process invokes an interface that references this resource, uninitialized bytes are exposed. Technical specifics of the affected component have not been published by Dell beyond the advisory reference in DSA-2026-278.

Attack Vector

An attacker with local, authenticated access executes an operation that triggers the uninitialized read. The returned data may contain leftover contents from prior memory usage. Because the attacker requires local access with low privileges and no user interaction, exploitation is straightforward once access is obtained but constrained by the prerequisite of appliance credentials.

No verified exploit code is available. Refer to the Dell Security Update DSA-2026-278 for vendor-supplied details.

Detection Methods for CVE-2026-56085

Indicators of Compromise

No public indicators of compromise have been published for CVE-2026-56085.
Absence of successful exploitation artifacts is expected because information disclosure via uninitialized memory typically leaves no distinct log signature.

Detection Strategies

Inventory Dell PowerProtect Data Domain appliances and correlate installed versions against the affected version ranges listed in DSA-2026-278.
Audit local user accounts on Data Domain systems and identify accounts with shell or CLI access that could invoke local interfaces.
Review authentication logs for anomalous local logons or repeated invocations of administrative commands by low-privileged users.

Monitoring Recommendations

Forward Data Domain system logs and authentication events to a centralized logging or SIEM platform for retention and review.
Alert on privilege boundary transitions and unexpected CLI command sequences originating from non-administrative accounts.
Continuously monitor Dell security advisories for updated patch metadata and any revised guidance on CVE-2026-56085.

How to Mitigate CVE-2026-56085

Immediate Actions Required

Apply the security update referenced in Dell advisory DSA-2026-278 to all affected Data Domain releases.
Restrict local and CLI access on Data Domain appliances to a minimum set of trusted administrators.
Rotate credentials for any local accounts that may have been shared or exposed prior to patching.

Patch Information

Dell has released fixed versions for each affected release train. Consult the Dell Security Update DSA-2026-278 for the specific fixed versions corresponding to the 7.7.1.0–8.7 mainline, LTS2026 (8.6.1.x), LTS2025 (8.3.1.x), and LTS2024 (7.13.1.x) branches.

Workarounds

No vendor-supplied workaround is documented; apply the patch as the primary remediation.
As a compensating control, enforce least privilege on all Data Domain local accounts and remove unnecessary shell access.
Segment Data Domain management interfaces on a restricted administrative network to reduce the population of users with local access.

bash

# Configuration example: verify Data Domain OS version and compare against DSA-2026-278
system show version
# Then apply the vendor-supplied upgrade package per Dell KB 000481268