CVE-2026-49814: Dell Data Domain OS RCE Vulnerability

CVE-2026-49814 Overview

CVE-2026-49814 is an OS command injection vulnerability affecting Dell PowerProtect Data Domain systems. The flaw resides in the Dell Data Domain Operating System (DD OS) and stems from improper neutralization of special elements passed to operating system commands [CWE-78]. An authenticated attacker with high privileges and remote network access can inject arbitrary commands into vulnerable code paths, resulting in arbitrary command execution on the appliance.

Critical Impact
Successful exploitation allows a high-privileged remote attacker to execute arbitrary OS commands on Dell PowerProtect Data Domain appliances, compromising the confidentiality, integrity, and availability of protected backup data.

Affected Products

Dell PowerProtect Data Domain 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-2026-49814 published to the National Vulnerability Database
2026-07-08 - Last updated in NVD database
DSA-2026-278 - Dell publishes security advisory covering multiple PowerProtect Data Domain vulnerabilities

Technical Details for CVE-2026-49814

Vulnerability Analysis

The vulnerability is classified as OS Command Injection under [CWE-78]. Dell Data Domain Operating System accepts input that is incorporated into operating system command invocations without adequate neutralization of shell metacharacters or command separators. An attacker who already holds high-privileged credentials on the appliance can supply crafted input through a remote interface, causing the underlying shell to interpret injected tokens as additional commands.

Because DD OS runs the backup and deduplication stack with elevated privileges, injected commands execute in a highly privileged context. This directly threatens the integrity of stored backups, replication targets, and retention lock guarantees that PowerProtect Data Domain systems are designed to enforce.

Exploitation requires prior authentication as a high-privileged user, which limits opportunistic attacks. However, this profile aligns with post-compromise scenarios where an adversary has obtained administrator credentials through phishing, credential reuse, or lateral movement from a compromised management workstation.

Root Cause

The root cause is insufficient input validation and neutralization when user-controllable strings are concatenated into shell command lines. Metacharacters such as ;, |, &, backticks, and $() substitution are not stripped or escaped before the command is passed to an operating system shell.

Attack Vector

The attack vector is network-based and requires an authenticated session with high privileges on the Data Domain management interface. No user interaction is required. The attacker submits crafted parameters to an affected administrative function, and the injected payload executes with the privileges of the DD OS command handler.

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

Detection Methods for CVE-2026-49814

Indicators of Compromise

Unexpected shell process invocations (sh, bash) spawned as children of Data Domain management daemons.
Administrative CLI or API sessions from unusual source addresses immediately followed by outbound network connections from the appliance.
New or modified files in system directories that do not correspond to documented DD OS updates or scheduled maintenance windows.

Detection Strategies

Enable and centralize DD OS audit logging, then hunt for administrative commands containing shell metacharacters such as ;, &&, |, or command substitution sequences.
Correlate authentication events for high-privileged Data Domain accounts with subsequent configuration changes and command executions.
Baseline normal administrative activity and alert on deviations, particularly outbound connections initiated by the appliance itself.

Monitoring Recommendations

Forward DD OS syslog and audit trails to a centralized log platform with retention that exceeds attacker dwell-time expectations.
Monitor privileged account usage on backup infrastructure with the same rigor as domain controllers and hypervisors.
Alert on failed and successful administrative logins outside approved change windows.

How to Mitigate CVE-2026-49814

Immediate Actions Required

Apply the Dell security update referenced in advisory DSA-2026-278 to all affected PowerProtect Data Domain systems.
Inventory Data Domain appliances against the affected version ranges and prioritize internet-exposed or multi-tenant systems.
Rotate credentials for all high-privileged Data Domain administrative accounts, especially where password reuse is suspected.
Restrict network access to the DD OS management interface to a small set of jump hosts and administrator workstations.

Patch Information

Dell has published fixed releases through advisory Dell Security Update DSA-2026-278. Administrators should upgrade to the fixed versions listed for each supported LTS branch. Upgrade paths are provided for the mainline 7.7.1.0 through 8.7 train, LTS2026 (8.6.1.x), LTS2025 (8.3.1.x), and LTS2024 (7.13.1.x) branches.

Workarounds

Limit administrative role assignments so that only a minimal set of accounts hold the privilege level required to reach the vulnerable code path.
Place the DD OS management interface on an isolated management VLAN accessible only through a hardened bastion host.
Enforce multi-factor authentication for all administrative access to backup infrastructure where supported by the deployment.

bash

# Configuration example: restrict management access via ACL
# Replace 10.10.20.0/24 with your administrative subnet
net acl add service admin-http source-ip 10.10.20.0/24 action allow
net acl add service admin-http source-ip 0.0.0.0/0 action deny